Here's another one that blew my mind when I first saw it. For vocals on a lot of records, the way it works now is the vocalist will just run thought X number of takes, beginning to end. Don't stop just because you messed up.
So you wind up with let's say 10 saved takes of the lead vocals. Then they go through it syllable by syllable and meld/splice the final product out of the best syllable for each syllable out of the ten takes.
Guitar solos are pretty similar. Lol