Through the remainder of the 1920s, Carter played at the Million Dollar and other theaters, including Sid Grauman's larger downtown venue,
Grauman's Metropolitan, the most capacious movie palace ever built in Los Angeles. The introduction of sound films, and then the onset of the depression, led to a declining demand for theater organists, and by the mid-1930s Carter had launched a career in the booming new medium of radio. He played on several network shows and also had his own local music show on Los Angeles station
KHJ. In 1936 Carter became the staff organist for the hugely popular
Amos N Andy radio show, a position he maintained until entering the Navy in 1942. He also made a film appearance in 1937, as himself, in the MGM short "
Sunday Night at the Trocadero". The 18 minute short contained a sequence with singer
Connie Boswell performing "
I Can't Give You Anything But Love", with Carter providing accompaniment on the Hammond organ. When, at age 90, he was asked about the making of this short and if there had been any further film appearances, he responded (with mock incredulity), "I don't remember making THIS one!" He spent
the war years serving in the Navy as a film officer in Alaska. Following the war he resumed his radio career, playing for such shows as
Bride and Groom,
The Whistler and
Suspense. He then moved on to television in the 1950s where he was the musical accompanist on
The Pinky Lee Show, the association with which produced a 78 rpm children's record on the Decca label that included Carter's rousing "Pinky Lee" theme on the Hammond. In 1961-1962 Carter had another local show of his own,
Everybody Sing with Gaylord, on Los Angeles channel 13
KCOP-TV. No known videotapes or kinescopes exist of this program. In 1959 Carter spearheaded a revival of silent movies, beginning at the Rialto Theater in South Pasadena, California with Douglas Fairbanks'
The Mark of Zorro. During these years he also continued to perform occasional live organ concerts, both at those few theatres which had maintained their silent era organs, such as
South Pasadena's
Rialto Theatre and
Seattle's Paramount Theatre, as well as public venues with theatre organs, such as the
Pasadena Civic Auditorium. He also made recordings on several of these vintage instruments, releasing numerous albums on the Artisan, RCA Victor, Malar, Pelican, New World, Win Mil, Delos and FTC labels. Carter had previously recorded pipe organ and Hammond organ singles during the 1940s on the Capitol, Black & White, and Imperial labels. Also, the pioneer "program music" impresario C.P. MacGregor made recordings of Carter in the 1940s. MacGregor had a recording studio located on Western Ave. in Los Angeles. These were Hammond organ solos, and are astonishing upon the listening as regards the musical styles and technique Carter displays in them. ==Silent movie revival and beyond==