The Dean Ween Group is in the middle of a brief West Coast fall tour, and stopped at the renowned Sweetwater Music Hall in Mill Valley, CA last night. As the show was near Deaner’s longtime friend Les Claypool, the bassist of Primus stopped by to perform a song.

Claypool sat-in for one song only, a performance of Ween’s classic tune “The Mollusk”. Watch fan-shot footage of the collaboration below:

Soundboard Audio:

Ween and Claypool are old friends, and at one point even considered filming a fishing show together with the help of Matt Stone and Trey Parker. Take a look at a clip from that below, which shows the two musicians on the open waters.

[Photo by Zach Zinnsman]