Nine acts have been added to the bill at the Xponential Music Festival, which is happening in Camden at the BB&T Pavilion and Wiggins Park from July 28-30.

The newbies are all playing at the cozier, outdoor Wiggins Park portion. The most novel name is Offa Rex, the new band comprised of Portland, Oregon prog-folkies The Decemberists (who headlined The Fillmore in Fishtown last month) and Olivia Chaney, the British singer whose ancient-sounding acoustic musical predilections dovetail nicely with those of Colin Meloy. And yes, since the Decemberists' leader is involved, the name is super nerdy: it refers to an 8th century king of Middle England. The band has a new album of trad English-Irish-Scottish folk songs called The Queen Of Hearts due in July.

Other new national acts added to the bill: Foxygen, the wildly inconsistent, sometimes brilliant California duo of Jonathan Rado and Sam France, Alynda Segarra's New Orleans politically minded folk-rock band Hurray For The Riff Raff and excellent Montclair, N.J. roots rock outfit Pinegrove.

Five local acts have also joined an already impressive local lineup up. They are: French-Philadelphian songwriting duo The Dove & The Wolf, country harmony trio No Good Sister, party band Swift Technique, expert jangle pop band Hurry and hip-hop band Hardwork Movement. Philly acts Strand Of Oaks, Amos Lee,  Dave Hause & the Mermaid and Hop Along are already on the show, as is Wilmington's David Bromberg Quintet.

The BB&T portion will be headlined by Wilco (with Conor Oberst and Hop Along) on Friday night and Spoon, plus Amos Lee & Friends featuring Preservation Hall Jazz Band, with the Suffers and Chicano Batman on Saturday. The full lineup is here.