Related Clues:

• Perform with the choir
• Bird's warble
• Sing like Slim Clark
• Join the chorus
• One begins "Rhapsody in Blue"
• Go caroling
• Song accompanied by an alpenhorn
• Try out for "American Idol"
• It includes pitching changes
• Swiss Alps refrain
• "Cliff Hangers" theme music on "The Price Is Right," e.g.
• Do a tune
• Sing like an Austrian, maybe
• Go up and down like a mountaineer?
• Vibrato