He formed Tuesday's Children, a harmony group that toured but never recorded.

Campbell sang in a harmony group with his brothers as children and performed with their father on stage.

On the radio a close harmony group was singing.

I'd been thinking of forming some kind of harmony group.

Calling themselves the Viewpoints, they were a four-part harmony vocal group.

The Backstreet Boys have always prided themselves as a vocal harmony group and not a boy band.

And when harmony groups began sprouting up all over Brooklyn, he formed his own.

Now, with the rise of harmony groups, listeners seem to be demanding full-fledged singers without giving up on the looks or the dancing.

By age eight Evans formed a street-corner harmony group, and by the time he entered high school, learned to play the piano.

They quickly started to focus on singing and became established as a harmony vocal group.