Gari was a popular singer and songwriter from the late 1950s and early 1960s. His best known songs as a performer are "Utopia", "Lullaby of Love", and "Princess", all of which hit the U.S. Billboardtop 40 charts in the early 1960s. Contributing to this early acclaim was Gari's unique rich voice blending with carefully selected melodic instrumentation and backup singers, all of which created a deep sense of magic, ethereal perfection, sincerity and emotion. With song writing partner Roger McGuinn of the Byrds, they wrote the song "Beach Ball" while working with singer Bobby Darin. Gari and McGuinn appeared on Capitol Records billed as the City Surfers. Frank performed his records on shows such as The Merv Griffin Show, The Steve Allen Show, and American Bandstand. He also performed at the world famous "Empire Room" of the Waldorf-Astoria Hotel in New York City with the Woody Herman Band. That year, he moved to Cleveland, becoming a jingle writer for television commercials. Some of his early jingles were for Ohio Bell, Genie garage doors, and early commercials for Wendy's. Frank has won numerous Emmy and Clio awards, and was later honored with the prestigious Lifetime Achievement Award from the broadcast industry.
Gari is best known today as a music composer and producer for television, and is also one of the most sought after composers of music for television newscasts in America. His first television theme and image campaign was the popular "Catch 5", originally written for WEWS-TV in Cleveland in 1970. Gari also created and produced the most popular television image theme in the history of the broadcast industry, entitled "Hello". He continued composing music for the American Broadcasting Company during the early and mid-1980s, and created such campaigns as "We're With You on ABC", "Now is the Time, ABC is the Place", and "Come On Along with ABC" with Artie Schroeck, as well as "That Special Feeling on ABC", and "You'll Love it on ABC". He also composed music for Eyewitness News on ABC such as WABC-TV, ABC's Good Morning America (in 1989), CBS This Morning, The Phil Donahue Show, and The Oprah Winfrey Show.
Gari also has international acclaim; in 1993, he composed the "Sky Symphony" theme for BSkyB in Europe, and the 1995 "It's On Sky" (also known as "No Turning Back") image piece. The Sky signature from the 1990s was spread to all the Sky channels, including Sky One, Sky Movies, and the defunct Sky Soap and Sky Movies Gold. Sky News used "The Great News Package" as their main theme from 1989 (when they launched their four-channel Astra lineup) until September 1993, and continued to use it (for main news bulletins on Sky News only) alongside the 'Sky Symphony' until 1995. He also composed the early 1990s theme for RTL in Germany called "News Line", which was later adopted by Maryland Public Television in the US, and in the Philippines it was adapted for the primetime newscast TV Patrol on ABS-CBN.