The Band. They got their big break playing with Bob Dylan.
Dylan was going through one of his (more than normal) weird streaks and they were a lot better than he was.

2 years ago I saw Chic featuring Nile Rogers open up for Duran Duran. Duran Duran were good, but Chic was awesome! I never truly realized how many hit songs Nile Rogers had written over the years, until that show.

Robin Trower opening for Ten years after.