Hardest/Easiest Ayu Songs to Sing

[Chibi_Venus]

I had an idea. ^^ Are there songs by Ayu that you have trouble singing? Is there one out there that you sing so well, it amazes even you? Tell us the songs you have trouble and are best with here.

I'll just be lucky if I can hit the notes in TO BE. I'm an alto, so only when I get in a singing mood I'll be able to sing it. I don't have much trouble with the words though.
I'll probably add more later.

My Best:
A Song for XX
Greatful days
HANABI
HEAVEN
I am ... (only when I actually hit the high E flat)
Moments (finally got up there!)
Pride
SURREAL (O_O)

My Worst:
ANGEL'S SONG
Because of You
GAME
HANABI ~episode II~
INSPIRE
July 1st
Over

I'll also add...

Ones I'm okay on: (* = close to best)
alterna
Bold & Delicious (if I have enough "soul" XD)
Dearest*
evolution
fairyland*
kanariya*
Memorial address* (just the words)
Naturally
no more words (surprisingly...)
ourselves
STEP you
teddy bear
Startin' (again, words)

I guess I can't really sing her rock songs. Look at that list! *dies*