I don’t think there are many great podcasts out there dedicated to music, but I recently stumbled on one titled And The Writer Is. It’s essentially interviews with songwriters and their process, and most are very entertaining.
I loved this one with John Feldmann. You know him from Goldfinger (Tony Hawks’ Pro Skater, anyone?) and he has produced albums for or discovered pretty much every band in the pop-punk/punk/emo/screamo scene for the last 20 years: My Chemical Romance, The Used, Blink 182, Panic! at the Disco, Atreyu, and the list goes on and on.
Dude even worked with Avicii. He is a beast.