I’ve been listening to a lot of metal lately and noticed that a song will start out with slow backup (sometimes just chords) and then some sort of fancy drum thing happens, and all of a sudden the band is playing really fast but the singer is still singing at around the same tempo. I know this is something I’ve heard in bluegrass too, but I can’t think of any specific examples, and I’m afraid to post the metal video because of copyright and whatnot.
I’m really just wondering if there’s a name for the backup tempo changing while the melody doesn’t. I don’t know if there are already videos on the site that explain that because I’m not sure of the terminology. Also how does it work? Do you just play a one-measure backup pattern but twice or three times within one measure?