What does Max Matsuura actually DO?

[Zeke.]

Practically everything by Ayumi is produced by Max Matsuura but what does it mean to actually "produce"? I see that it is said in all of her albums and after the credits in CDLs and Tours, but is that only because he is the one that "produced" Ayumi Hamasaki, or in other words, discovered/made her a star? What is there to "produce" at a CDL and TOUR if it is "visioned" by Ayumi Hamasaki? Also, what is the difference between composed by and produced by? How can a song be composed by one person and produced by another? I am confused...