A Cappella, I recently discovered, is a form of music in which the band members perform songs WITHOUT musical instruments !!!
And before you guys run-off to read more about this fascinating art form on Wikipedia, just check out this video of an A cappella band called “Canvas” performing the theme song of the longest running sitcom on television, “The Simpsons”.
For those of you who are not aware of The Simpsons, check out their original theme song first and then compare it with the A cappella performance :