With a list of credits from Kesha, Dolly Parton and Deer Tick, Miranda Lambert and Little Big Town, pedal steel savant Spencer Cullum is one of Nashville’s most in-demand session cats. That’s in addition to making up half of the space-country duo Steelism. Clearly he’s had little trouble fitting in since moving from his native London to Music City. Now, with a debut solo album that pays homage to the ’60s and ‘70s psych-pop, folk and proto prog heroes of his homeland, this Nashville sideman’s stepping out from the shadows into the spotlight. Along with a supporting cast of guitarist Sean Thompson and multi-instrumentalist Luke Reynolds, as well as singing and writing partners like Caitlin Rose, Andrew Combs and Erin Rae — he’s bringing a bit of Britain to TN.