Sometimes not even a rehearsal. Chuck Berry was famous for just showing up minutes before he was supposed to go on and using whatever musicians happened to be

Sometimes not even a rehearsal. Chuck Berry was famous for just showing up minutes before he was supposed to go on and using whatever musicians happened to be around. Apparently, lots of not-yet-famous musicians were in Chuck's backup band at one time or another, Springsteen among them. https://boundarystones.weta.org/2017/03/21/when-chuck-berry-had-boss-his-backup-band https://boundarystones.weta.org/2017/03/21/when-chuck-berry-...