While serving in the military during World War II, he met guitarist Al Viola and bassist Lloyd Pratt, with whom he formed a trio. After the war's end they performed together in the style of the Nat King Cole Trio, scoring a number of hits in the late 1940s, including "The Three Bears", "Walkin' My Baby Back Home", and "All of Me". The trio appeared in the films A Song Is Born, Big City, Lullaby of Broadway (with Doris Day) and Romance on the High Seas (Doris Day's first film, in 1948). He recorded dozens of tracks with Doris Day, Frank Sinatra, Dinah Shore, June Christy, Mel Torme and other legendary singers.
In the early 1950s, Cavanaugh had a program, Page Pages You, on the short-lived Progressive Broadcasting System. Additionally, the trio played on Frank Sinatra's radio program, Songs by Sinatra, and on The Jack Paar Show.
Cavanaugh played in Los Angeles nightclubs through the 1990s, both in a trio setting (with Viola for many years) and as a septet, the Page 7. He recorded with Bobby Woods & Les Deux Love Orchestra. He recorded for MGM, Capitol, RCA, Star Line, Tiara, and Dobre Records over the course of his career, releasing his final trio album, Return to Elegance, in 2006.
- Page Cavanaugh Carries the Torch (ERA, 1956)
- The Girl (Vaya, 1956)
- Page Cavanaugh Plays for the Cocktail Hour (Tops, 1957)
- Fats Sent Me (Capitol, 1957)
- Music for the Cocktail Hour (Craftsmen, 1958)
- Softly (Time, 1964)
- Is Alive (Dobre, 1978)
- Return to Elegance (Moon over Leg, 2006)
- "Pianist-singer-composer led an enduring Southland trio". Los Angeles Times. December 24, 2008.
- Scott Yanow, Page Cavanaugh at AllMusic
- "Page Cavanaugh, Leader of Jazz Trio, Dies at 86". The New York Times. Associated Press. December 25, 2008.
- Jazz Pianist-Singer Page Cavanaugh Dies at 86. CTV News, December 24, 2008.
- "WCFC Music Shows To Offer Wide Choice". The Raleigh Register. November 26, 1950. p. 14. Retrieved September 5, 2015 – via Newspapers.com.
- Schaden, Chuck (Spring 2009). "Necrology for 2008". Nostalgia Digest. 35 (2): 55–59.