A popular disco-era fingerstyle riff is to pluck an 8th note, followed by two 16ths an octave higher (e.g., chorus of YMCA). I'm struggling to play this at a brisk tempo. I'm plucking the low string with p, then using m and i (in that order) for the octave string. This aproach seems to minimize hand movement, but I've not made good progress. Any suggestions on alternative fingerings? Any help would be greatly appreciated - I could really impress the neighborhood kids if I could groove to YMCA with clean execution!