The Temple Troubadours
From Rocklopedia Fakebandica
Robbie's Band" episode (21 Dec 1961) of classic sitcom My Three Sons. Robbie (trumpet) is annoying the house rehearsing with his high school classmates. They sound terrible, but Dad Steve (Fred MacMurray), who had a jazz band back in college (Steve Douglas and His Five Disciples of Rhythmania), ends up helping out the band, and they improve enough for older brother Mike (Tim Considine) to audition them for a dance at his frat.
In later seasons, Robbie goes rock with The Greefs.