Bon Iver played a show on Sunday night at London’s All Points East festival where Justin Vernon and the band closed out the set with recordings of new music, NME reports. Watch clips of the songs fans speculate are titled “Hey Ma” and “U” below. The band performed “Hey Ma” live at Bonnaroo.

Bon Iver also displayed a cryptic link to a new website called “icommai” on the screen. The site’s most recent post features a lengthy list of collaborators, including Moses Sumney, The National’s Bryce Dessner, Brad Cook, Psymun, Bruce Hornsby, and others. Check out the full list on icommai.com.