That's also the importance of consistent patterns. Bluegrass and bop music, both extremely high-speed improvisational forms, have a couple of key things in comm

That's also the importance of consistent patterns. Bluegrass and bop music, both extremely high-speed improvisational forms, have a couple of key things in common. First, time signature... they are strictly 4/4, which makes "chunking" a lot easier. Second, they are built on really common harmonic structures (I/IV/V chords in bluegrass, ii/V/I cycles in bop). Third, they have standard repertoires, and all musicians beyond beginner level are expected to know a lot of standards by heart. So the complexity of certain parts of the music are tightly constrained, which frees the performers to tackle other forms of complexity (like improvisation) much more aggressively.