Halestorm got the festivities started at the Monster Main Stage on Day One.
The quartet hailing from just outside Philly showed some serious brotherly love as singer Lzzy Hale and drummer Arejay Hale move past any qualms of sibling rivalry to offer a unified front of classically inspired rock 'n' roll.
Starting off with 2008's title track "Sound of Madness", Shinedown (who only retains Smith and drummer Barry Kerch as original members) offered a blistering call to arms followed quickly by the raucous soundtrack number "Diamond Eyes".
Shinedown's love ballad "If You Only Knew", weakened the mood but only before a moment until "Devour" and early single "Fly from the Inside" made appearances. did nothing to persuade with new single "Bully", a weak attempt at banking on a popular national issue, they made up for it with a haunting acoustic cover of Lynyrd Skynyrd's "Simple Man".
Frontman Eddie Veliz let his hair down for "Falling Down", expertly massaging his fret board while daring the microphone to be his bullhorn.
If Kyng commanded simplicity, then In This Moment are the darlings of spectacle.
The Alter Bridge frontman, who had just two chances to appear on Slash's eponymous 2010 solo debut that also featured the likes of Ozzy Osbourne and Chris Cornell, earned his keep as the exclusive singer on new album Apocalyptic Love.