From LIFE archives.
Frank and Dean, Making Beautiful Music
"I don't discuss his girl with Frank or who he's going to marry. All I discuss are movies, TV, golf and drinking." –Dean Martin, date unknown. Pictured: The stars, photographed in a recording studio by LIFE's Allan Grant, take a cigarette break during the recording of Sleep Warm in 1958. The album was re-released in 1963 with a much more direct title: Dean Martin Sings/Sinatra Conducts.
Lights, Camera, Fedora
"He likes to pretend that he cannot remember lyrics and, blowing a line while singing, will gaze appealingly heavenward and plead, 'Don't just look down. Help me!' When he is on stage with other famous folk, the air is likely to clatter with competitive ad libs, many of which have been polished to perfection by re-use.... A favorite Martin target is his ex-teammate. 'These muscles,' he will declare, flexing his abundant supply, 'I got them from carrying Jerry Lewis for 10 years.'" —From LIFE's "Make-a-Million Martin," 12/22/1958. Pictured: Martin on the set of an unknown production that year.