Say what you will about Foo Fighter's Sonic Highways but the band IMHO gets better with each album. Their HBO special is a good primer for each city profiled- by no means is it a complete picture- but it's a nice starter for a world that is growing increasingly away from it's musical roots. In terms of musical roots, cities like Detroit are yielding gems such as Jessica Hernandez & the Deltas and Orange County's jazzy singer Nancy Sanchez. Aside from emerging artists, there are legends and legacies like Flaco Jimenez & Max Baca (who should've been nominated for a Grammy), John Garcia (Kyuss and Unida) one of my all-time fav vocalists with his best riffs since Kyuss, and the blazing rock duo that is Royal Blood wth their electric guitar like sounding bass.