Alpine show-off

• One calling at peak times?
• Old-time country singer, sometimes
• One calling from a Swiss mountaintop
• Alpine caller
• Singer heard in the Cliff Hangers game on "The Price Is Right"
• Person who sings like someone in the Swiss Alps
• Producer of high and outside pitches?
• Peak performer?
• Alpine singer, perhaps

Wiktionary Word definitions in Wiktionary
n. One who sings so that their voice fluctuates rapidly between their normal chest voice and a falsetto, one who yodels.