This was a merger of two of the most well-known and established brands in rock. Ozzfest, celebrating its 20th anniversary, and Knotfest, which debuted in 2012, joined forces over the weekend to bring metal fans an epic balls-to-the-wall festival featuring a wide range of metal acts such as Municipal Waste, Suicidal Tendencies, Megadeth, Disturbed, and playing their last California show, the fathers of metal Black Sabbath.

Megadeth at Ozzfest

Disturbed at Ozzfest

Disturbed at Ozzfest

Disturbed at Ozzfest

Megadeth at Ozzfest

Megadeth at Ozzfest

The two-day music festival has drawn tens of thousands of revelers, and about 3,400 campers.

Authorities say 30 people have been arrested during the first day of a music festival in San Bernardino.

The arrests occurred Saturday during Ozzfest meets Knotfest, which was held at San Manuel Amphitheater on Glen Helen Parkway.

Photos below taken by Boston Lynn Schulz

Disturbed at Ozzfest

Disturbed at Ozzfest

Disturbed at Ozzfest

Disturbed at Ozzfest