Looking for the name/singer of a song played at Starbucks?

So, I heard this song a couple of weeks ago in Starbucks. I don't remember any words, but the singer would go something like, "a ha ha ha ha." Then, a group of people in the song would repeat, "a ha ha ha ha." It's an upbeat, happy song . . . the kind that would make you smile while you're singing along. It felt like an updated version of the kind of song that might have been played by a big band at a club in the 1940s and 50s. Does anyone know this song?