Lucius fans got one heck of a big surprise last night (May 4) during the encore of the group’s performance at New York City’s Beacon Theatre, when Pink Floyd’s Roger Waters made a guest appearance on a largely acoustic cover of his band’s classic “Mother.” Lucius’ Jess Wolfe and Holly Laessig previously toured as part of Waters’ band in 2017-18 during his Us + Them tour, on which “Mother” was not part of the set list. However, Lucius previously performed The Wall track with Waters at the 2015 Newport Folk Festival and at one of their own shows in London in 2018. https://www.youtube.com/watch?vbRRzCdnfWTk Waters, 78, has not played a full live show since the end of the Us + Them tour in 2018, but will return to the road with his This Is Not a Drill tour on July 6 in Pittsburgh. Meanwhile, Lucius is touring in support of its latest Mom + Pop album, Second Nature, which came out last month. The group performed the album’s “Dance Around” Tuesday on The Late Show With Stephen Colbert, which featured guest appearances by Sheryl Crow, Stay Human and Celisse. In our conversation, the duo told us what it was like to work with co-producers Brandi Carlile and Dave Cobb, and why they went in a different sonic direction.