I've featured a number of fine balloon-related songs and videos here on the site (see here, here, and here), and compared to the videos in there, this video from South Florida band The Postmarks is a bit bland. It's from season 1 of Yo Gabba Gabba!, and so a little old. But the song is so, so lovely.
The Postmarks - "Balloons" (from Yo Gabba Gabba!) [YouTube]