Keller Williams has revived his Grateful Grass tribute project, and performed a benefit concert for the Rex Foundation at The Fillmore in San Francisco, CA last December. The performance was released yesterday as Dos, and can be downloaded via Live Downloads, starting at a mere $9.95. All proceeds go to benefit the Rex Foundation, which is a human rights education program.

Grateful Grass consists of Keller Williams, alongside mandolinist Jeff Austin (formerly of Yonder Mountain String Band), bassist Keith Moseley (of String Cheese Incident), and multi-instrumentalist Michael Kang. To entice you, the group released their performance of “Bertha” from the live Dos album.

Here’s the full tracklisting:

1. Bertha

2. Jack Straw

3. Sugaree

4. Greatest Story Ever Told

5. Till the Morning Comes

6. High Time

7. Samson and Delilah

8. Althea

9. Tennessee Jed

10. Shakedown Street