Question: What year was the rock supergroup formed that included the American guitarist, singer, songwriter, and performer born in 1953?
Sentence (from "Bad Company"): Bad Company is an English hard rock supergroup formed in Westminster, London, in 1973 by two former Free band members—singer Paul Rodgers and drummer Simon Kirke—as well as Mott the Hoople guitarist Mick Ralphs and King Crimson bassist Boz Burrell.
Relevant evidence: No