Yo, I got into this like 6 months back...wasted like a week playing with MIDI files and redoing them...Had that STill DRe and California LOVE sounding RIGhT, lol
Like dude said, just search MIDI...there are sooo many sites. Some better than others, but at the same time just know some of the files are better than others (as far a groove and closeness of instruments to original)...have fun