Thurs. Feb. 11 

We've always loved soundscapes, music that builds upon layers and layers of sound, some gentle, some not, that allows you to create movie in your own head. Mountains - Brendon Anderegg and Koen Holtkamp- are that. The Brooklyn-based duo crafts startling ambient electronic soundscapes that seamlessly integrate field recordings and acoustic instrumentation into the mix, creating complex but often relaxing songs. Each one builds in momentum, layering on organic and electronic sounds. That's what they did ontheir latest and third CD, "Choral." On Thurs. Feb. 11 Mountains plays live at the Cambridge YMCA Theatre. The guys have been friends since their middle school days. They both ended up at the School of the Art Institute of Chicago. It was during this time that they began exchanging musical ideas and compositions which led to them founding the Apestaartje label in 1999. Their most recent record, "Etching,"  is a live recording on Thrill Jockey. Writes Dusted: "A pitch-perfect combination of earthiness and abstract bliss." They'll remind electronic/art music fans of Cluster, Eno, Popol Vuh and they'll weave a tapestry that will both soothe and stimulate. Opening up: David Daniell and Tim Hecker.  Tickets: $12. Starts at 8.

820 Massachusetts Ave., Cambridge, 617-661-9622 or 617-876-4275 www.WorldMusic.org or  www.cambridgeymca.org/theatre.html