In a new video update, MEGADETH bassist David Ellefson checks in from the second day of the Rockstar Energy Drink Mayhem Festival at the Shoreline Amphitheatre, Mountain View, CA. Watch the video below:

Along With Megadeth, Rockstar Energy Drink Mayhem Festival's 2011 lineup includes DISTURBED, GODSMACK, IN FLAMES, TRIVIUM, and many more of today’s most electrifying artists.

The tour began its 26 date trek across the country beginning on July 9th at the San Manuel Amphitheater in San Bernardino, CA.

Rockstar Energy Drink Mayhem Festival Tour dates:

July

10 - Shoreline Amphitheatre - Mountain View, CA
12 - White River Amphitheatre - Auburn, WA
13 - Idaho Center Amphitheater - Nampa, ID
15 - Desert Sky Pavilion - Phoenix, AZ
16 - Hard Rock Casino Albuquerque Presents The Pavilion - Albuquerque, NM
17 - Comfort Dental Amphitheater - Englewood, CO
19 - Verizon Wireless Amphitheater - Maryland Heights, MO
20 - Riverbend Music Center - Cincinnati, OH
22 - Comcast Center - Mansfield, MA
23 - Parc Jean-Drapeau - (Heavy MTL) - Montreal, QC
24 - Comcast Theater - Hartford, CT
27 - PNC Bank Arts Center - Holmdel, NJ
29 - First Niagara Pavilion - Burgettstown, PA
30 - Jiffy Lube Live - Bristow, VA
31 - Susquehanna Bank Center - Camden, NJ

August

2 - Virginia Beach Amphitheater - Virginia Beach, VA
3 - Time Warner Cable Music Pavilion at Walnut Creek - Raleigh, NC
5 - First Midwest Bank Amphitheatre - Tinley Park, IL
6 - DTE Energy Music Theatre - Clarkston, MI
7 - Verizon Wireless Music Center - Noblesville, IN
9 - Zoo Amphitheatre - Oklahoma City, OK
10 – Gexa Energy Pavilion - Dallas, TX
12 - Aaron's Amphitheatre at Lakewood - Atlanta, GA
13 - 1-800-ASK-GARY Amphitheatre - Tampa, FL
14 - Cruzan Amphitheatre - West Palm Beach, FL

As previously reported, Megadeth has set TH1RT3EN as the title of its new and 13th album, tentatively due this fall via Roadrunner Records. The CD was recorded at the band's own recording facility - Vic's Garage studio - in San Marcos, California with producer Johnny K (DISTURBED, 3 DOORS DOWN, FINGER ELEVEN). Dave Mustaine officially announced the title of the new album on stage on July 8th at the U.K. edition of the Sonisphere festival at Knebworth.

At a one-off gig from the European Big 4 shows, (July 4th) Megadeth debuted their new track, 'Public Enemy No.1', live in Hamburg, Germany at the Docks.

"I wanted to do something for you tonight to show you how much we appreciate you instead of saying you're a great audience," leader Dave Mustaine told the crowd. "We're gonna play a new song for you. This song is from our new record, [it's] never been played anywhere, never been heard by anybody but us. This song is called 'Public Enemy No. 1'."

Watch fan-filmed footage of the new track below: