If you're looking for an excuse to get outdoorsy, Saturday is the 4th annual National Get Outdoors Day — and an Ann Arbor musician's ode to the great outdoors has been chosen as the "GO Day" anthem.

Folk musician Joe Reilly’s music aims to help kids appreciate nature with environmentally minded albums like “Children of the Earth and “Let’s Go Outside,” according to event organizers.

His title song “Let’s Go Outside” has been named the event's official song for 2011.

Reilly will perform the theme song and other work at an outdoor concert Sunday at the Leslie Science & Nature Center in honor of GO Day.

The concert is 3 to 4:30 p.m. at the center, 1831 Traver Road in Ann Arbor. The cost is $10.

The U.S. Forest Service has planned programs around the nation aimed at helping connect kids to the natural world. The celebration is meant to support President Barack Obama’s America’s Great Outdoors initiative and first lady Michelle Obama’s Let’s Move Outside campaign, aimed at combating childhood obesity through healthier lifestyles that include time spent outdoors, according to a Forest Service press release.

For more event locations, visit the Forest Service’s National GO Day website.

Listen to Joe Reilly's "Let's Go Outside":

Juliana Keeping covers general assignment and health and the environment for AnnArbor.com. Reach her at julianakeeping@annarbor.com or 734-623-2528. Follow Juliana Keeping on Twitter.