Modifies a noun

• singer: With more than doo-wop singers place in a a sponsored seat.

• group: They were a doo-wop group that had one release on the Chance label in Chicago.

• song: The song is both a swanky orchestral number and an acoustic doo-wop song.

• day: From the doo-wop days of the 1950's, the sweet soul sound of the 1960's, the superstar 1970's and 1980's and beyond.