Soundcheck Edit this Published by Soundcheck Yonder Mountain String Band Listen 29 min Queue Download this audio Want to embed this player? Use the code below. More info. <iframe frameborder="0" scrolling="no" height="130" width="100%" src="https://www.wnyc.org/widgets/ondemand_player/soundcheck/#file=/audio/json/223214/&share=1"></iframe> Share on Facebook Share on Twitter Email a Friend They've been called progressive bluegrass, jamgrass, rockgrass - even "ragegrass." Whatever they are, the Colorado-based Yonder Mountain String Band stops by our studio to perform live. Watch the band play their song "Don't Worry, Happy Birthday" below.