As Crosby, Stills and Nash criss-cross the country this summer, they are not only playing the hits and some hidden gems from their catalog, but also new, unreleased music. David Crosby has been doing one new song, "Radio," and recently debuted another, with the working title "If She Called."

He's been doing the song solo on electric guitar, telling audiences it's about a Belgian prostitute.

Crosby is working on new music with his son, James Raymond, who is the keyboardist in CSN's backing band. They've written as many as 14 new songs, but he is not yet sure how he will release them. But he warns us that it "will probably go right over the heads of most of the listeners out there."

CSN is in Boise, Idaho tonight and then has the next 10 days off before resuming September 4th in Phoenix.