. "Oom-pah, Oompah or Umpapa is the rhythmical sound of a deep brass instrument in a band, a form of background ostinato.The oom-pah sound is usually made by the tuba alternating between the root (tonic) of the chord and the 5th (dominant) \u2014 this sound is said to be the oom. The pah is played on the off-beats by higher-pitched instruments such as the clarinet, accordion or trombone. Oompah is often associated with Volkst\u00FCmliche Musik, a form of popular German music, and with polka."@en . .