You could start a thread if you would like, but I don't know how many instrumental song versions are out there. People might lose interest in posting vids if they have to do an extensive search.
Before I was asked to start this thread, I thought about starting a song parody thread. Of course, people would really need to do some searching for the "good" ones. Some of the vids made by amateurs are really lame. lol
That's what I like about the random music video thread. As long as it's music, share it with the masses. Original music, remixes, parodies, and even instrumentals can be posted here. Just like the original RMV thread, there are no rules. Just good folks having fun and sharing their favorite tunes.