Jack Casady (born John William Casady, April 13, 1944 in Washington D.C), is an American musician considered one of the foremost bass guitarists of the rock music era. First playing as a lead guitarist with the Washington D.C. area rhythm and blues band "The Triumphs", he switched to bass during his high school years and while still underage, played the Washington D.C club scene, backing artists such as Little Anthony and the Imperials.

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