The members of RatDog and Govt Mule demonstrated their command of the classic-rock catalogue during their two-night run at San Diego, CAs Humphrey’s Concerts by the Bay. On Tuesday, RatDogs Jeff Chimenti and Kenny Brooks kicked off the evenings collaborations by sitting in with Govt Mule on Turn On Your Lovelight, shortly before Bob Weir and Mark Karan appeared with the group for takes on Bob Dylans ‘I Shall Be Released’ and Neil Youngs ‘Cortez the Killer,’ respectively. During RatDogs set, keyboardist Danny Louis returned the favor by appearing on a version of The Bands The Weight, while Warren Haynes joined Weir and company on a run through Grateful Dead chestnuts like Bird Song, He’s Gone and Sugaree, as well as Chuck Berrys Johnny B. Goode.

Last nights performance also featured a hefty dose of cross-pollination. During Govt Mules performance, Karan emerged for Nobody’s Business But Mine, Brooks played saxophone on The Jealous Kind and Weir and Chimenti made a joint appearance on Death Don’t Have No Mercy. Later in the evening, Haynes sat in with RatDog once again, this time on Tennessee Jed. Govt Mule and RatDog will spend the evening of July 3 in Las Vegas, NV.