Ayu - LOVE ~Destiny~, SEASONS (AO), July 1st. They were all the songs I kind of started with (LOVE~Destiny~ and SEASONS after their actual release, then I sort of re-discovered Ayu with July 1st)
Utada - First Love. One of the songs to showcase the magic of J-Music.
Morning Musume - I WISH, LOVE Machine, Furusato. The first two I REALLY love, and the last one showed me how mature they can get. No matter what, I'll still listen to them.
Amuro Namie - CAN YOU CELEBRATE?, NEVER END, I have never seen. All three my first songs in J-Music, while CAN YOU CELEBRATE? was probably my favorite for the longest time. Still listen to it quite often.
ZONE - Secret Base ~Kimi ga Kureta Mono~. another one of my first songs...
Matsu Takako - Sakura no Ame, Itsuka. I fell in love with this song because of her voice, and the simplicity of the lyrics.
Sakai Noriko - Aoi Usagi. Probably the first song I ever listened to in J-Music.
Le Couple - Hidamari no Uta. The second, most likely.
KOBUKURO - Tsubomi. I just love it. So many memories.
I have a lot, actually.