Few singers have been able to change with the times like Johnny Mathis. Although his fame rests on his massive popularity in the 50s and 60s when he competed with Elvis and Frank Sinatra and outsold almost anyone, Mathis has remained relevant through the decades and no other crooner is as technically skilled or able to cover multiple genres so convincingly. Jazz, soul, disco, country, classic and contemporary pop, Mathis has adapted his impressive...