Musicians promoting social causes is nothing new. But clothing company Horny Toad is working on a creative collaboration with singer-songwriters Brett Dennen and Chris Pierce. Together they’ve created a limited edition t-shirt collection for the 2009 spring season called “Good for the Earth Good for the Soul.”

The organic cotton t-shirts feature music lyrics and artwork from both Dennen and Pierce, and a percentage of all the proceeds will be divvied up among causes close to Horny Toad’s and the artists’ hearts; Search for Adventure, Greater Los Angeles Agency on Deafness Inc. and The Mosaic Project will all be benefiting this upcoming season.

Dennen has a soulful voice, and has been compared to artists such as Jack Johnson, Tracy Chapman and Neil Young. His relaxed melodies are perfect for the chill-out, surfer, beach-inspired lifestyle that Horny Toad seems to attract with its lifestyle apparel. Even for those who tend to shy away from folk/pop, he’s worth listening to. Check out his video for “Ain’t No Reason” below: