Switzerland. Canton Nidwald. Engelberg valley. Swiss alpine farmers. Kernalp. 1800 meters high. Alps mountains peasants. Choir of men singing. Yodeling. All men are standing and have their hands in pants' pockets. Yodeling (also jodeling) is a form of singing which involves repeated and rapid changes of pitch between the low-pitch chest register (or "chest voice") and the high-pitch head register or falsetto. © 1996 Didier Ruef