The majority of the music was written by Nobuo Uematsu.
Kings of Leon
James Horner wrote the music for the 1996 Titanic.
Mozart wrote ternary music.
Andrew Lloyd-Webber wrote the music from Cats.
I go to http://www.ffpianomelody.com/ for my ff piano sheets. It's the better site I have found so far. They offer hassle free downloads.
Music of Final Fantasy XII was created on 2006-05-31.
Music of Final Fantasy III was created on 1990-05-25.
Music of Final Fantasy IV was created on 1991-06-14.
Music of Final Fantasy IX was created on 2000-12-06.
Music of Final Fantasy VI was created on 1994-05-25.
Music of Final Fantasy XI was created on 2002-06-05.
Music of Final Fantasy XIII was created on 2010-01-27.
Music of Final Fantasy V was created on 1993-03-25.
Music of Final Fantasy X was created on 2001-08-01.
Music of Final Fantasy VIII was created on 1999-03-20.
Music from the Final Fantasy video game series can be downloaded from FF Music and FF Shrine. There is also a website called 'Final Fantasy Radio' which offers tracks.
The music for Final Fantasy 7 can be listed to at YouTube and Laguna's Jukebox. There are many Final Fantasy music and video files, which one can choose to view or listen to.