The four-day Great South Bay Musical Festival is now fully underway along the water in Patchogue.

Thursday’s lineup was headlined by Taking Back Sunday and Glassjaw.

Scroll down for 20 photos from Benny Migliorino of Benny Migs Photo in Patchogue. The festival runs through Sunday, July 21. Click here for everything you need to know.

Click the 2, 3 and 4 boxes to view all the photos.