[YUKARI]

Originally Posted by RayJason

"M" is a song written by Japanese singer Ayumi Hamasaki from her album I Am... (2002).[1] The lead single from the album and Hamasaki's nineteenth overall, "M" marked Hamasaki's increased creative control over her music, as it was the first song she composed, under the pseudonym "CREA".

Hamasaki's staff had composed the melodies; Hamasaki only wrote the lyrics. However, with "M", Hamasaki felt that none of the melodies composed by her staff fit her vision of the song. Consequently, she decided to compose the melody herself.[3] She began work on an electronic keyboard; however, as she had little proficiency in the instrument, Hamasaki eventually resorted to singing the melody into a voice recorder.[3]

so that's just exactly as I thought.

Originally Posted by Ayumi_lover

^ but composing song and making arrangement are different things. She composed it but didn't do the instrumental track all herself

yeah, I understand it. I said she was only singing melody, she didn't even write notes, just humming as Andrenekoi said.

one thing she composed and arranged by herself is "Wonderland" from MY STORY.