Produced by CASA, these compilation CDs are a great introduction to different genres of a cappella, and are particularly recommended to the novice listener. Including groups such as Penn off the Beat ('Fall from Grace') Heebee-jeebees ('Angels We Have Heard on High') Da Vinci's Notebook ('Liposuction') and the King's Singers ('Abendlied'), the proceeds benefit CASA and allow the organization to continue in its efforts to promote a cappella singing. Other groups featured are The Fairfield Four, Vox One and Rockapella.