Summer music fests: Heavy metal, country Pictures Summer music fests: Heavy metal, country Summer is the season to take it easy, a time of relaxation, calm reflection, and the soothing sounds of . . . heavy metal! Because summer also brings countless music festivals, where fans of all genres can get their kicks, with or without air conditioning. The Gigantour concert - held Friday, July 19, 2013, at The Rave in Milwaukee - featured Megadeth guitarist Dave Mustaine (left). Credit: Jake Barlow/CBS News