[UPDATED] Yesterday, the lineup for Gulf Aid was announced, with headliners Lenny Kravitz and Mos Def. Since then, R&B singer John Legend has been added to the bill, along with Big Sam’s Funky Nation.

Tickets are on sale now at elevate.com for the show, which will take place Sunday from noon-10 p.m. at Mardi Gras World River City on the banks of the Mississippi River. The show’s a benefit to raise money that will help families affected by the oil disaster in the Gulf of Mexico, as well as raise awareness of the fragility and importance of the Louisiana wetlands.

Those who want to help but can’t make the concert can contribute by sending checks to:

GULF AID
P.O. Box 6917
Metairie, LA 70009

Update 1:02 p.m.: Steve Riley and The Mamou Playboys with Jon Cleary, BeauSoleil avec Michael Doucet, Marcia Ball and Shamarr Allen have also been added to the lineup.