Question about "M" ~

[RayJason]

Hi guys,
I had an question about one of Ayu`s songs: M.

I read about this sing so much on the internet and many sites said that Ayu made the whole song herself (Ofcourse she did the lyrics and vocals but these sites stated that she also made the instrumental track herself. Like a componist.

And I really wonder why she did this and if she composed more songs, it`s all so vague to me :-Q.

Edit; The reason why i am asking this is because today is the first time ever I listened to thisbtrack and I feel that it`s really out of place in the A COMPLETE ~ALL SINGLES~ album. I love it though but this was the least that I expected from Ayu.