[quote name='tauzero' timestamp='1437730256' post='2828526']
...I have noticed that there's something of a tendency for songs to have a not-quite-repeating structure - so in the old days you'd learn intro, verse, chorus, clever bit, and outro, and mix and match the verse, chorus, and clever bit as required, but songs like "Riverboat Song" or "Last Nite" have a not-quite-repeating structure that means you have to learn the whole song in a linear fashion.
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In the 'old days' too, actually... in my opinion the not-quite-repeating structure is a sign of a good arrangement and good songwriting. So often are songs now just cut-and-paste verses and choruses - quite literally in fact, since the advent of the DAW. Even a verse or chorus that is ostensibly the same will have minute differences if played in real time from start to finish by real musicians, which is what makes music interesting.