This clip is from a 1982 Tyrolean choir from the Austrian Alps performing an unusual piece of mouth percussion. The choir, known as the Tiroler Zungenpritschler (the "tongue splashers of Tyrol"), used only their tongues to create musical sounds, including clicks, rolls, and pops. The choir is performing the song "A Gaudi muss sein" by Austrian composer Franz Mika. Credit: ORF Archiv | History In Pictures