Composer & Arranger, Did Ayu choose it herself?

[mellody]

What I'm going to ask is,

"Who decides the composer & arranger for Ayu song?

I've been thinking about this for a while, who decides that?
I know Ayu only wrote the lyrics for every song that she has.
In tour, I heard Ayu decides the setlist, and some of performances as well.
For PV, Ayu herself also decides if it's ok or not right?
Also how about photographer?

Because I heard that every release should involving Ayu decision as well, probably since... 2003?

If it's true, I think it's possible too if Ayu herself choosing the composer and arranger for every release, she might choosing some certain person for some reason, something like "Maybe this man could make a song which represent my feelings correctly."

Anyone knows about this?