The main opening and closing theme song to Larry David’s Curb Your Enthusiasm is entitled “Frolic.” It was composed by Italian composer Luciano Michelini. It is said that David heard the song in a bank commercial years before and thought that the song had a joyful quality—a perfect match to the show’s otherwise gloomy feel.
There is an official soundtrack for the show released by Mellowdrama Records in 2006. It, of course, contains “Frolic” and, if you’re familiar with the show, the other songs used between scenes.
Below is an audio-only video of “Frolic.” I’ve yet to see a complete opening sequence video in YouTube.