Last night Justin Bieber guitarist Dan Kanter joined Bob Weir at TRI Studios to tape for an episode of Weir Here. TRI has announced that this installment of the show will air on September 11 at 5:30 PM Pacific. Kanter shared the above photo of his appearance with Weir and Tweeted “Amazing day filming at tri_studios w/ Bob Weir. Such an honor to play so many classic songs with him.” Kanter, who has been touring as Justin Bieber’s guitarist for many years, is a longtime Phish and Grateful Dead fan. Last month, he joined Mike Gordon and Jon Fishman for an improvised set at Chicago’s Second City Theater following Phish’s rained out show at the First Merit Bank Pavilion.