H is for Harmony

The Yale Whim n' Rhythm chorus demonstrates harmony (and A Capella) perfectly with this number.

The ghost of Amy Winehouse is tapping her toes in time!

~DJ Tempest~

A is for Acapella

From the Wikipedia entry:

A cappella (Italian for "in the manner of the church" or "in the manner of the chapel") music is specifically group, or solo, singing without instrumental sound, or a piece intended to be performed in this way.

Thus, the song above does not really fit the criteria, because it does have instrumental accompaniment. But it is pretty damn cool nonetheless.

This is actually a much more accurate example of Acapella.

~DJ Blooming Psycho~