So, while a single a-side was supposed to get you up and interested, a B-side wasn’t. In fact, many bands - particularly mainstream bands - would plop dud choons on the B-side, convinced that no-one was listening.
Nope. The fans were listening. And boy, did some fans get annoyed with the shit they found there. Why would your favourite band slip you sludge on the B-side? You pay good money, you expect a decent track on the flip.
Smarter (and poorer) bands began to use the B-side to their advantage - slipping in a cracking live rendition of a familiar song, or a joke or experimental track. Hell, a record costs money to make, you don’t want to spend all that just to waste the space on the flip. Hence The Damned’s crackling rendition of “Help!”, the Beatles song performed with kettle drums at a million miles an hour. Brilliance.