Hello everyone,
I'm sorry if this question, in one shape or another, has been asked on here before. Scrolling through youtube I came accross this video of John Scofield on comping and improvisation. The first section (I think the first 4 minutes) involves a lot of talking and playing about with chords harmonized in 4ths. What exactly does this mean? For example with a CMAJ7 would the notes CEGB all move up a fourth along the C lydian or major scale (and as a side-question, why has he chosen lydian for this instead of major?), or would a separate major scale start on each on these notes and take the fourth from that to construct a new chord?