How often do you hear a guitar/organ/accordion combination? The example that springs to my mind is the late Zydeco great Clifton Chenier, who had an organ in his Red Hot Louisiana band at different times. In fact, I believe that Stanley Dural Jr. played organ for Chenier. That name may not be as familiar to you as his later stage moniker, Buckwheat Zydeco.
I stumbled across The Three Suns surfing around on You Tube. They feature Al & Marty Nevins on guitar & accordion and Artie Dunn on organ and were a popular act in the 40’s. Here’s the stylish Beyond the Blue Horizon.