Guitar Hero World Tour

With any instrument besides vocals go to your Main Menu select Music Studio, then select Recording Studio. Now, select Create New Song, then select Create New Song again. Once you are in the studio, select any instrument from the list. Once you've done that hit Right on your D-pad to start the song and then hit Left on your D-pad to start recording notes. You need to record or play at least 20 notes.

Once you are done recording notes hit Left on your D-pad to stop recording and Right on your D-pad to stop the track. Hit Start, select quit, but don't forget to save. Go down to your song in My Songs and select it. Scroll down to Publish Song, select a genre and select Upload to GHTunes, then select slot one. Agree to the submission rules and you're done.