Ive been attempting to master the 8th-16th-16th octaves found in in disco tracks like Rod Stewart's "Do Ya Think Im Sexy" and the Village People's "YMCA" chorus. I can do it slowly, but when I try to get up to speed find I keep raking my index finger over the D or A depending on the octave involved. Slows me down and sounds dreadful. Any tips on how to play octaves across the neck quickly and cleanly? The other octave issue I have is with a REAL simple line - Hollywood Nights by Bob Seeger. It starts on an open E, and it just keeps ringing & blending into the higher E. I can mute the lower E if I play the higher E on the A string 7th fret but then the higher E keeps ringing. I don't want to have to tune down - any tips on how to get this sounding correct?