On August 6th, red rocker Sammy Hagar dropped by country star Kenny Chesney's show at Levi's Stadium in Santa Clara, CA. He took over the stage for a performance of "I Can't Drive 55"; check out the footage below.

Hagar: "Kenny sold out 50,000 and then brought me out for 'I Can't Drive 55'. I couldn't believe hearing 50,000 people scream 55 at the top of their lungs!! Certainly one of the highlights of my year musically so far!! Always love hanging and playing with Kenny. Miranda Lambert was great as well, 2 of Samantha's favorites. Samantha is turning into a country girl ha ha too cute." 

On May 15th, Hagar and Metallica frontman James Hetfield held their Acoustic-4-A-Cure concert at The Fillmore in San Francisco, California.

Says Hagar: “I sincerely want to thank everyone for their participation in this year's Acoustic-4-A-Cure, we hit it right one the mark again. Together, we helped give a lot of children a better chance at a long life and we had a blast doing it! It doesn't get any better than that. James and I will have our hands full trying to top this one next year. Thank you, thank you all."

The event saw Hetfield perform acoustic versions of two Metallica songs: "Motorbreath" and "The Unforgiven". He also offered up a cover of the Screamin' Jay Hawkins tune "I Put A Spell On You". Check out fan-filmed video below.

The third annual Acoustic-4-A-Cure concert benefiting the Pediatric Cancer Program at UCSF Benioff Children's Hospital also featured appearances by: Joe Satriani, Melissa Etheridge, John Mayer, Train frontman Pat Monahan, Vic Johnson and Kris Kristofferson.

Acoustic-4-A-Cure was created by Hagar and Hetfield, whose vision was to raise needed funds and awareness for the Pediatric Cancer Program at UCSF by bringing together some of their legendary friends and throwing a must-see concert for fans. In past years, artists including: Billie Joe Armstrong, Jerry Cantrell, Pat Monahan, Linda Perry, Chad Smith, Adam Sandler, Joe Satriani, Nancy Wilson, and more have joined Hagar and Hetfield to rock the sold-out benefit concerts.