i believe that emotion can be conveyed with equal intensity with either slow or fast playing. think of Stevie Ray Vaughan's "Riviera Paradise" or "Rude Mood" or "Scuddle Buttin'." Particularly, with "Riviera Paradise," he plays slow, delicate phrases, punctuated by lightning quick ones. you con feel the emotion in his playing, particularly when you can move with the current of the song itself, feeling the depth and breadth of the slow tempo; and sensing the more compact, dense, fast and ferocious waves of notes washing over you.
musical phrasing and improvisation are more or less the same for all instruments in western music. think of John Coltrane. he played incredibly fast, and moved with phenomenal dexterity; but with this incredible speed came a flurry of notes ("sheets of sound" is a common description of Coltrane's phrases); an intellectual, and emotional sound.
speed can be emotional, even if you're playing one note over and over and over again. even monotony can tell a person a great deal about how you feel. one could say the musician understands where a person would be anoyed with the droning of a single note, plucked at a constand high speed. on any given day, i might call it "masochistic music," (just for example anyway).
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