church street five
Head Start Music Group was created in 2005.
Air Supply
If you're speaking of music that is sung or performed in a canon, this is when there is a set piece of music & there are multiple groups. The first group will start singing or playing, and then the second group will start back at the beginning when the first group reaches an indicated measure or part.
Choir
Counting Crows the Cure the Cadillacs
The music group known as the dolls got their start in the music industry in 2009 by signing a record deal with Sony Records. This ultimately launched their music career.
"The Kinks" and "The Killers" and "King Harvest"
A round in music is a song which can be sung by two or more groups of people. One group starts off and the next group start to sing the same song a bit later. When a group gets to the end of the song they start again.
The only group which I can think of that fits the requirements is the rather obscure band "CirKus"
Jonas Brothers
C + C Music Factory was founded in 1989. The groups first album was titled "Gonna Make You Sweat" and climbed to number two on the Billboard 200 chart in 1990. The group was most popular in the early 1990's.