I like my music cut fairly straight-ahead. I like to feature each artist as he or she does their best part of the song. If performance is what you want to show, then less is more. About as far as I would take it is to lay some half-dissolve doubles, where the same person is shown in facial close-up and wide shot. But these don’t always look good unless there was a lot of dark blank space in one or both shots. To generate those if they weren;t originally shot that way may be more trouble than it is worth.
Now, you *could* go for something kitchy if every band is covering the exact same song. It would help if they are all in the same key at least, but yes, juxtaposing them all in the course of one identical tune might be fun to watch, depends on the song. It should be something light and up-tempo, I’m thinking. You could multi-box them simultaneously on the screen, then fly them into closeup as they alternate, kind of Woodstock-1 like… or maybe you composite them into an old TV which is channel-surfing to make the cuts.
Or at some point skip the bands altogether, just use the audio, and show someone listening to it, and their clothes, makeup, and action change as the versions of the song change.
There was a music video on imovie for some band, the theme was they are in everyday dress and go vinyl shopping at a used record shop. They find their band’s section in the bins, and in there are like 20 albums faked up by the art department, going back what looks like 20 years and covering about every major music/pop culture trend in album cover art and band costumes, mocking a few very well known covers like the Beatles, Kingston Trio, Police, etc.. They cut away to the bands “live” in the various time periods for tiny samples of the same song performed in the multi styles. The song was not memorable, but the visuals were fun.
Wish I could remember a title for you…