This is a pay per post ad. But it gave me a chance to post a Monkees YouTube video, so I would have done it anyway.
Encyclocentral A is a website with an alphabetized list of hyperlinked topics such as A Cappella. "What's A Cappella," you ask? Well, it means without instrumental accompanyment. Like this.
This is Riu Chiu from the Monkees Christmas Special.