Janelle Monae, The Doors' Robby Krieger and Skrillex will join Grateful Dead star Mickey Hart for the annual Superjam at this summer's (14) Bonnaroo Music Festival in Tennessee.
Warpaint, Chance the Rapper, Damian 'Jr. Gong' Marley and Zedd will also perform with Hart and company at the event in June (14), while Andrew Bird, Chaka Khan, Taj Mahal and Ben Folds will perform with guitarist Derek Trucks at another live jam, and The Hangover star Ed Helms will host the festival's The Bluegrass Situation Superjam, featuring Dierks Bentley, Sarah Jarosz, Lake Street Dive and Yonder Mountain String Band banjoist Dave Johnston.
Last year's (13) Bonnaroo Superjam featured My Morning Jacket frontman Jim James, John Oates, R. Kelly and Alabama Shakes' Brittany Howard.
Bonnaroo 2014 begins on 12 June (14).