Seattle based rock band Pearl Jam will be joining Jay-Z at the Made in America Music Festival. While Bajan songstress Rihanna recently made a surprise appearance at Jay-Z and Kanye West's London's O2 Arena Watch the Throne show, on Sunday night, May 20, the rockers were announced as headliners for one night of the Philadelphia gig, set for Sept. 1 and 2 at Benjamin Franklin Parkway in Fairmount Park.

Jay-Z is curating the Budweiser-sponsored fest as well as headlining himself. Other artists on the bill so far include indie acts Passion Pit -- a band who Jay-Z gave a shout-out to at his 2010 Coachella gig -- and Dirty Projectors.

The festival may also play host to a long-awaited R&B comeback. There are varying reports as to whether D'Angelo will perform at the event, but it is still to be confirmed.

Made in America tickets go on sale on Wednesday May 23 at 10 a.m. EDT. The festival is expected to include 28 acts overall.

Rihanna sings "Run This Town" with Jay-Z and Kanye West in London: