Ah Love songs... my favorite Ayu album. Gonna dissect the album bit by bit...
Colors:
I think it's the 1st time in an Ayu album where one color literally dominates the covers and booklets... peachy pink.
It's a girly color, and I think it represents the sort of girlish/child-like innocence of the theme (Love). She wants to display it as a young, fresh, innocent kind of thing. While the lyrics do not entirely describe the idea of "Love" as such, it's clear she wants the album to be portrayed as such.
Also note her look - ponytails, traditionally associated with young girls. Innocent smiles, album covers appear to be shot at a rice field or something. It's very southern farm girl... very very vanilla and pure.
Title:
While "Love songs" don't mean much on its own literally, and many take the album as it is about a bunch of love songs, I believe what it really means is "a collection of love".
The songs inside aren't exactly about romantic love (generally easy to assume due to the dominant color of the album and our general impression of "love")... but more on "a collection of love" in our lives... and each song quite displays a different kind of love.
Love:
1) Love Song - Love for Love
The supposed title track sums up what the album really is about - a collection for love.
Love Song goes through the roller coaster ride that is love - while she proudly declares in the chorus for her/our love for "Love, Dreams & Music", she also mellows in the verses about the other side of love - regret, pain and selfishness.
It is one of her most poignant and accurate title track for an album and man I love this song so much.
2) crossroad - Love for the Past
Nostalgia is a power emotion & "crossroad" mainly sings about our thoughts on "what would happen if I had chosen this back then instead?"
Love for nostalgia is a big theme in crossroad: she repeatedly asks herself her feelings on the past, and what would have been... 'what if...?'
The last chorus/stanza echoes her thoughts in "Heartplace" from the RAINBOW album. I paraphrase... "When I looked at the girl, why was it that I couldn't even look at her?" in crossroad vs "When I looked at the girl I knew in the past, tears rolled down uncontrollably".
A feeling of escape and moving on was in crossroad, as though she knew the past was something she cannot return to, but she can only move on. Yes, life is a crossroad, but sometimes we can only have love for our past.
3) MOON - Love for Pets
Ah the summer song of Love songs...
Um it's highly debatable that MOON is about a romantic love but I actually beg to differ. She gives HUGE hints in the PV that MOON is really about her dead dog.
Remember that Ayu doesn't exactly write lyrics in the most literal sense, but in an abstract manner. While it's easy to read it as a past lover, I would say it's about a past pet.
Of course a dog literally cannot stare at you with its eyes and asked if you loved it, but in an abstract and poetic manner, why not? Ayu is busy at work most of the time anyway, even if said dog is in the studio or whatever, it's understandable she won't have time to be with it all the time... and when it passed away, I would think the sadness and regret from it gave pen to MOON.
4) sending mail - Love for the Unrequited
One of the masterpieces of the album and one of the few that shows a very mellow side to love.
Throughout the song is an upheaval of sounds and volumes... and the lyrics mainly talk about how she wishes to be forgiven and be able to stay close to someone, and wanting to let him/her know about it makes it so painful, and it is almost embarrassing to be honest to that person that eventually, she had to "delete" the mail she wanted to send.
In a way, such cowardice and fear was also in "No way to say", but while that is of a very shy manner, "sending mail" confronts these emotions directly. She knows she is weak, and she sings about it. It's beautifully painful... and just wow.
5) Last angel - Love for the Future
While crossroad deals with the past, Last angel deals with the future.
Throughout the song she sings about past mistakes she may have made (merry nights and lonely mornings) but there is much hope about an angel who has appeared, "An angel smiled, I don't look back or gloss over the past anymore..."
It should be about Mannie but whoever it is for, Last angel clearly sings about a hopeful future that she is looking forward to, and is therefore a love for the future.
6) insomnia - Love for Sleep (no I'm just kidding 
)
I wouldn't go much over interludes but I'd like to point out the irony in insomnia. After a hopeful song in Last angel, it is ironic for insomnia to kick in - it gives an idea that while the future is hopeful, it gives us fear too. An ability to rest because we're busy thinking of the future...
7) Like a doll - Love for Life
Much like what
Andrenekoi said in above post that "Like a doll", "Don't look back" & "Marionette" are all songs sandwiched between 2 interludes, they also have a common theme - do not lie to yourself, do not betray yourself, do not run away.
"Marionette" takes this in a dark manner with a glimpse of hope, "Don't look back" deals with this in a personal and honest way, and "Like a doll", to me, takes these ideas in an uplifting attitude.
"Please do not live like the dead", is a line often repeated, and while in the other 2 songs she only goes about the situation, in "Like a doll" she talks about what actually happens - "Your heart will feel no pain or sadness, but you will never feel joy either."
I get the idea that's who she is, and meeting a new love opens up the possibility of her being able to be honest with herself. She wants to feel love and joy, and to do that, she must feel pain and sadness... she must, well, be human.
9) blossom - Love for Innocence/Purity
In our melodramatic ballad, blossom, a common theme runs in the lyrics - We never know what we will be like when we grow up into adults, and our strength in our youth is precious.
10) Thank U - Love for Fans
Well I'm pretty sure this is obvious enough, lol.
11) Sweet Season - Love for Simplicity
as
labello draws the comparison between "YOU" & "Sweet Season", which I concur, I also believe SS is really about a love for simplicity.
it's a very "you and I" kinda song, going through seasons together and appreciating each other's strength to move on in life.
it is simple, relaxing, which explains the Country-esque genre of the song.
of course the PV is a talking point imo, because it brings forward the simplicity theme to the next level. very 60s, very happy, Ayu in a happy family with kids, a hot hubby and a Labrador. and finally a pool party!! in the summer! it's the American Life people dreamed of...
until at the end we realized she was merely dreaming, and the ending being a good prequel to the Party Queen era. it shows to me her insecurities too, that although she had love and hope for all these beautiful things, a part of her can never shake off the doubt because all good things must come to an end.
13) do it again - Love for Sacrifice
dance, dance, dance, do it again.
Hmm, how do I put this. do it again honestly imo isn't exactly about love in any sense, but growing up as an adult, and the kind of sacrifices you have to make.
after "sending mail", "do it again" is probably the other songs heavily on the dark side of love.
drawing reference from "Naturally", "being sad is the same as giving up", it's clear she's on the road of reminiscing, and the kind of things she sang about in her younger days, while still may be true, don't exactly fit in every situation. the naivety she had while young, comes back to haunt her as an adult, because as an adult, you have to make sacrifices.
in the end, she asks the listener what he/she is thinking about, and concludes that "only a dream can..." can what? we don't know, but we are led to believe "only a dream can escape".
14) November - Love for Romance
It's clear as a November sky that November is about Mannie, and our attitude towards this powerful, romantic love that would never falter. never let go, always hold onto his hands, blah blah blah, yup because "nobody in this world is used to losing"
15) Virgin Road - Love for Parents/Gratitude
While "Thank U" blatantly describes gratitude for fans and people who believed in her, "Virgin Road" goes on the personal gratitude toward her mom.
In the PV it appears it is her Bonnie & Clyde fantasy with Mannie but the lyrics clearly is a big "Thank you" to her mom. she has never written a fully positive song toward a direct family member. the closest, "Who..." brings nostalgia and wistfulness, but in "Virgin Road", there is hope... "please watch over us", "a single, warm tear falls"...
I see it as a coming of age song, in her adult days and coming close to a marriage, she realizes the kind of happiness her mother must have felt and for whatever she could have faulted her mother for, she knows she must thank her and ask for her blessing.
16) SEVEN DAYS WAR - Love for Being True To Yourself
I'll just conclude this with one line:
"I will fight, just so I can be myself."
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So yes, my analysis on the concept of Love songs. It truly is one of my favorite albums, her most cohesive and closely themed... everything was near perfection.
And I wrote an album review when it was released, you can read it here:
http://junniejunxiang.livejournal.com/2592.html