Every Monday after they finish rehearsing, members of the Barbershop Harmony Society's Oakville Chapter head down to their favorite Tim Hortons and order a cup of coffee and a donut.

YouTuber Moto2h spent the better part of several hours putting together this rather remarkable music-less version of the "Gangnam Style" music video, replacing the audio with the song's official a capella version and sprinkling in everyday sound effects to make up for the missing madness.

For its weekly three-hour dubsteb block "Wob Wob Wednesday," 3voor12 Radio invited members of the Kyteman Orchestra's 40-piece Dario Fo choir to perform an a cappella cover of the Skrillex dubsterpiece "Bangarang."

[Last Friday, Barack Obama abandoned Bill Clinton at a press conference to attend a Christmas party. Big mistake! Because at the party, he had to "hang" with an a cappella group — an exhausting process. Image via Pete Souza/White House.]

GQ editor Mickey Rapkin has written a book called Pitch Perfect: The Quest for Collegiate A Cappella Glory. If that wasn't funny enough, it turns out that practically half the world has a shameful a capella singing-group past! And he names names—including Osama Bin Laden.