Nashville is a city of great guitarists, and Guthrie Trapp (opens in new tab) is one of the best. So when he shares knowledge with his online guitar lessons it's well worth listening.
Here in a 22-minute tutorial on his YouTube channel he shares some insight into The Pentatonic Myth and how the minor and major pentatonic simply don't work over everything. So you need to know more – and here he explains what you'll need.