A whistle or call is a simple aerophone, an instrument which produces sound from a stream of forced air. It may be mouth-operated, or powered by air pressure, steam, or other means. Whistles vary in size from a small slide whistle or nose flute type to a large multi-piped church organ.
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What is AC/DC's most popular song according to Spotify?
B. Highway to Hell
C. It's a Long Way to the Top (If You Want to Rock 'n' Roll)
D. Back in Black