The singers say they chose their group's name because of the courage required to do five-part harmony in a world obsessed by hip-hop.

Consider, too, "Apple Blossom Time" in soothing five-part harmony by the ensemble.

The song was a showcase for the band's close harmony singing; the first and last verses feature all five Eagles singing in five-part harmony.

In his hands the electronically enhanced accordion approximates the sound of a full swing band playing four- and five-part harmonies.

Enter its front door to an ensemble of Italian marbles singing to the eye in five-part harmony.

"Dealing with four- or five-part harmony, the sound can only get that big," Mr. Wilson said, motioning with his fingers.

Akiyoshi often uses five-part harmony in her voicings, which yields a bigger sound from her horn section.

Originally a four-person ensemble, the group have expanded to five-part harmonies, with a sixth member acting as a sign-language interpreter.

The ensemble tackles difficult five-part harmonies and composes much of their own music.

At 14, as a junior camp counselor, she turned color-war songs into five-part harmonies.