Inside a tiny, tin-roofed recording studio in Hammond, La, resides a booming voice heralding all things rock and roll.

While JJ Redick contributed to the beginning of players-only podcasts, Paul George also launched his own podcast with casual discussions.

Every Tuesday, Dillon Tanzos arrives at radio station WDIY in Bethlehem, Pa., just before 6 a.m. He turns the lights on, ...