Blues Traveler recorded an upcoming episode of eTown at the Boulder Theater on Sunday, showcasing classic hits “But Anyway,” “Run Around” and “The Mountains Win Again.” John Popper and the crew surprised their sing-along congregate with a harmonica-infused rendition of Sublime’s radio favorite, “What I Got.” Blues Traveler will release its new album “Blues Traveler 25” on March 6.

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Karson Brown is a Denver photographer and a regular contributor to Reverb.