I’ve had two songs stuck in my head over the past week, and they’re both from unexpected sources: the opening sequence from a TV show. With the spring TV season over and the summer season not quite started yet, it’s been a slow couple of weeks, so I’ve taken the opportunity to catch up with HBO’s “Treme” and “True Blood.” I’m liking both series, but have been enthralled by their catchy credits. They’re pretty much the only ones on any network that I don’t reflexively fast-forward through.

Opening credits and theme songs have been falling out of fashion on network TV for the past two decades, but they’ve maintained a foothold on cable series (“Mad Med,” “Dexter” and “Rescue Me” have great ones). HBO, especially, has a history of treating the opening credits as almost a short film, perfectly capturing mood and atmosphere (look at “Six Feet Under,” “The Sopranos” and “The Wire”).

But “Treme” and “True Blood” are two of the all-time best, perfect combinations of striking visuals and insanely catchy songs. I love how the “Treme” opener juxtaposes scenes of post-Katrina New Orleans, with mold taking on the appearance of art, with the joyous celebrations of times gone by.

Watch this, crank up the volume and you’ll be sashaying the rest of the day. The song is “Treme Song” by John Boutte.

The vampire-soap “True Blood” has a more ominous and disturbing sequence, with imagery of sex, death and rebirth. The song is Jace Everett’s “Bad Things.” Man, that decaying fox creeps me out every time.