Previously stuck in your brain: theme songs

I just heard a real blast from the past on my local oldies radio station: the theme from The Rockford Files. If you were around in the mid-1970s, you likely know it, even if you never saw the show. I still recognize Peter Gunn’s theme from even earlier, but I’ve never seen the show. If you actually watched Rockford, you may still get a mental flash of James Garner going through a supermarket. Regrettably, the networks have largely dispensed with theme songs. You can’t hum a “Previously on …” segment, and they don’t have much relevance beyond the show’s regular viewers. Yeah, I know a few shows still have ‘em, but they aren’t exactly making the charts. If you’re not a Psych viewer, can you hum its theme?