Repetition
Music purists will tell you that electronic notation in general, and copy-paste in particular, is the scourge of music. Hit the Cntrl-C / Cntrl-V combinations (or their Mac equivalents) and you've increased the length of your piece at no extra cost. Most people would probably want to hear that riff again, anyway. Composers of old didn't have software to facilitate it, so perhaps they had to invest more thought into repetition; but they could equally well pencil in the double bar lines with bracketed ends, likewise at little cost and to the same effect: play that bit again (I think it's cool). Everybody has done it, from Bach (whatever his variant of 'cool' was) to Burt Bacharach. Used by master and novice alike, repetition is not necessarily a reflection of competence; indeed, repetition is a nearly inescapable component of music. Like most of music, though, it is incredibly difficult to do right and at the right time. Context is a key component in any decisio