Who is the lead singer of the rock band Led Zeppelin?
Robert Plant is an English singer, songwriter, and musician, best known as the lead singer and lyricist of the rock band Led Zeppelin. The plant is regarded as one of the greatest singers in the history of rock and roll. In 2006, Heavy Metal magazine Hit Parader named Plant the "Greatest Metal Vocalist of All Time".
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Before the 19th century, how many people were needed to make pipe organ play?
at least two