Philadelphia’s WXPN kicks off its three-day XPoNential Music Festival this afternoon, bringing a lineup of musical acts in the Triple A vein to Wiggins Park on the scenic Camden Waterfront. From two main stages and a Kids Corner, more than 50 artists will perform blues, rock, surf, R&B/soul and music that defies easy categorization. For those of you in Mid-Atlantic region: tickets are still available! But if you can’t make the Fest, tune your browsers to the WXPN stream here, where the station’s live broadcast coverage will be offered as a webstream throughout the weekend. Today’s coverage begins at 4:30 EST.