March 14 [14:00 EST] -- They Might Be Giants are about to unleash an epic testament to their work ethic with the release of "Then: The Early Years," a 72-song double CD compiling their earliest recordings.

The collection, which arrives March 25, features the duo's first three albums as well as 15 unreleased tracks from the over-achieving combo who gave the world such quirky classics as "Istanbul (Not Constantinople)" and "Ana Ng.

You might recall that John Flansburgh and John Linnel, who formed TMBG in 1986, unveiled the material with a full band in tow during their recent string of three shows at New York City's Irving Plaza. They've also recently upped their visibility quotient with appearances on NBC's "Late Night With Conan O'Brien" and HBO's "The Larry Sanders Show.

In case you're wondering, They Might Be Giants takes its moniker from the George C. Scott, Joanne Woodward film of the same name, but the duo insists the movie holds no other significance to them.

For more on They Might Be Giants, check out their website at www.tmbg.com.