I'm posting it in rockabilly since I've adopted this sub-forum. I've been learning learning Wayne Hancock's "Johnny law" by ear and the bass has me a bit messed up. It's a 1-4-5 in A but there is a descending run on the E chord that keeps messing me up. Would a Lydian mode apply here? I've always thought that it would go I/ionian IV/Lydian V/Mixolydian so that all the notes stayed in the same key (except chromatic changes) The Lydian doesn't seem to quite fit though and that's what is throwing me off. Tell me what you think please.