it is rare to find such uncopyrighted material... i heard there is a site that list music that is like "open source"...but you much google it for yourself.. and for downloading instrumentals... YES it is illegal to download instrumentals of copyrighted music.. UNLESS some amature o pro made a .MID (MIDI) sequence file for karioki or some personal use... but it may have usage limitations.. such as making your own music for making money... or playing it in public entertainment purposes... but thanx for asking.... because i know many people aound love to ask the same question but dont ... dare... lol... but persoanly your question has a thousand anwsers...... so I can only answer the best way...thanx