Thank you very much J0. Yes I absolutely loved the first Rayman. The Sonic games on Genesis and Game Gear, and Rayman on PSX are my top favorites platformers .
About the music, I first write synth and drums parts with a score editor and export them to a midi file. Then I import this midi file in Cubase (a multi track sound editor) and play those midi parts with some Native Instruments plugins to have some realistic instrument sounds. I finally record guitar tracks (i plug the guitar directly into the sound card, and use the Native Instrument Guitar Rig amp simulator) and export everything to an MP3 file.