WXPN's yearly festival, held at both the Susquehanna Bank Center and Wiggins Park in Camden, N.J., has announced the headlining roster for this summer's XPoNential Festival, Friday July 24 through Sunday, July 26.

Headliners for Saturday, July 25's show at the Susquehanna Bank Center are My Morning Jacket and St. Vincent.

Tickets are on sale Friday, March 20 at 1 p.m. WXPN Members will have access to a pre-sale starting Wednesday, March 18 at 10 a.m.

Big artist alert: My Morning Jacket are prepping for the release of their new album The Waterfall, hitting the world on May 4, while St. Vincent is coming off a big Grammy win for Best Alternative Album at this year's awards for her self-titled release.

Last year's headliners included Beck, Band of Horses, Ryan Adams and Jenny Lewis.

Talent for the Wiggins Park shows will be announced on Tuesday, March 31, when 3-day passes go on sale.