For the third weekend in a row, the former Van Halen frontman joined Teddy Swims onstage in the desert for a performance of "Jump" Teddy Swims followed up his back-to-back Coachella performances with a potent set at Stagecoach on Saturday and once again brought out David Lee Roth for the occasion. After singing his new single, “Mr. Know It All,” and “Some Things I’ll Never Know” from his debut studio album  I’ve Tried Everything But Therapy (Part 1) , Swims invited the former Van Halen frontman onstage to once again play “Jump.” Like the duo’s previous two performances at Coachella, it was a standout moment at their Stagecoach iteration as fans fist-pumped the air in dusty cowboy hats and belted the lyrics.…