With more and more indie musicians making children’s albums in recent years — and everyone from Chromeo to MGMT recording songs for shows like “Yo Gabba Gabba!’’ — it’s getting harder to tell anymore where the line is between music for “the kids’’ and music for actual kids. Brooklyn indie-pop duo Matt & Kim have straddled that line since the surprising success of their 2009 album, “Grand,’’ and its gloriously effervescent single, “Daylight.’’ With little more than plinking and repetitive, if deliriously catchy keyboard riffs, straightforward dance-punk beats, and jocular vocal whimsy, their third record keeps the party going hard — even if it’s more the cake-and-ice-cream variety. Capturing the wide-eyed abandon of youth in a package this street-savvy, and just downright likable, isn’t quite so easy as it might seem. To sell a song like “AM/FM Sound’’ — with its crush on “Just Can’t Get Enough’’ translated into Morse code riffs and a singsong chorus — you’ve got to be having as much fun as your intended audience. The kids grow up fast now, but the impending stream of kinder-hipsters weaned on their folks’ iPods should keep Matt & Kim flush for years.
Matt & Kim play the House of Blues Thursday.