Hollerhan has 1 Sonic Symphony concert.

SONIC SYMPHONY is a Los Angeles-based music production house that specializes in writing original music and sound design for high-end motion picture, television and video game advertising campaigns. Since the launch in the summer of 2009, Sonic Symphony's music has been licensed in over 40 hollywood blockbuster movie trailers including The Amazing Spider-Man, The Dark Knight Rises, Captain America, Thor, Sherlock Holmes, Tron Legacy, Wrath of the Titans, and many more.