The recorded music equivalent might be "That's why you have to listen to the records." Much as you might be tempted to gaze at the cover art, remember a band's last record or think about the one time you saw them live and they really blew it, prejudging can be dangerous. In the end, you still gotta listen.
So there I was, waving around a CD copy of Pop Art Live, by 1970s power pop band, The Raspberries about to launch into a tirade about how most bands from the '70s should just stop.…