This has been a complaint of mine for years. We know that back in the day that artists would have certain singles edited or shortened for radio play. Very few songs over 5 minutes existed in Top 40 radio. Save for maybe Let it Be or American Pie.
The worst of the worst has to be Edgar Winter's "Frankenstein". The cut up job -- from 5+ minutes in its original form to 3 minutes on that great tune -- is just ridiculous. The whole gist and feel of the song is lost. I just heard that tune again today in its bastardized version and I cringed.
Other songs given similar bad treatment were Elvin Bishop's "Fooled Around and Fell in Love". Bad bad bad.
Any others? Just asking. Thanks.
p.s. Oh, and for morality sake there's Charlie Daniels' "I told you you once you son of a gun ...". :)