They say that good music keeps you at the edge between familiarity and surprise. Too familiar becomes boring, and too surprising becomes hard to follow. Musical improvisation is the manifestation of this in real time, and you can usually notice when the player is engaging in well-established/familiar patterns ("licks") and when the player is creating something completely original. I'm used to improvising a lot on guitar, and I've noticed that I'm able to imagine impossibly intricate and original lines of improvisation in my head, but I'm in no way technically advanced enough to manifest that through my instrument. When I listen to the most complete virtuostic improvisational players out there, even though they can come very close many times, I always feel a tension between boredom and impenetrability. Of course, this desire I have of hearing the most hyper-creative lines of notes that I can possibly imagine is impossible to fulfill. It's completely relative to my unique conception of music, and I would probably never in a million years get to hear somebody produce even 10 seconds of those exact notes (which would be absolutely transcendentally orgasmic if it happened). Nevertheless, I know two players who come extremely close, and I'll try to weigh to which extent they're too "boring" ("musically conventional" is a better word) or too impenetrable (too melodically or harmonically complex) relative to my impossible standard of imaginative perfection.   Guthrie Govan (obviously). It's tricky, because he is so versatile that he often fluctuates between too conventional (like bluesy bendy stuff) and too complex (like jazzy shredding stuff). I'll give an example for each player:   Allan Holdsworth is notoriously known for being impossible to imitate by other players. For reference, Guthrie Govan can imitate virtually anyone but him. He often becomes too complex. I sometimes have to listen to his songs 30 times to understand what he is doing (like the run at 1:28 in the video below). (Btw things become more interesting around 0:40).