Again with the music

It’s hard to catch the vast world’s tune;
 it goes on so long:
 it’s surprising when it begins to repeat
 to know it well enough to like it.
 Then, there’s the instrument I’m stuck with,
 embarrassing for its narrow applicability.
 Oh, well; here goes —
 and I blow or strike or strum or sing
 and accentuate the melody
  or compensate with harmony
  or engage in counterpoint
  or remain silent, waiting for a dramatic
       crash of symbols or discharge of canon
 and, at some point, appropriately — artfully
 add to life’s symphony.