

Maybe about 10-15 years ago, there was this song by a group called One Eskimo that a local radio station did its duty in trying to force it to be a hit by gushing over it, and playing it all the damn time. It was a duet, but the male and female singers recorded their parts at ever. so. slightly. different. tempos.
Gah! Absolutely caused me physical discomfort listening to it. Like, wanting to jump out of my skin. Luckily, the effort to force the song up the charts failed (probably because it’s awful), and I’ve never heard it since. Amy Winehouse’s “Rehab” is bad for the same reason, but the tempo of the vocal track is so far off from the tempo of the backing band that it doesn’t cause that effect.
None. The value-add that good schools and curriculums provide is curation of information, and presenting it in a time-efficient way. For a practical demonstration of the value, try learning Linux shell scripting only from man pages.