from NHL.com,

Metallica will perform the national anthem prior to Game 4 of the Stanley Cup Final between the Pittsburgh Penguins and San Jose Sharks at SAP Center on Monday (8 p.m. ET; NBC, CBC TVA Sports). The Sharks trail the best-of-7 series 2-1.

The heavy metal band comprised of James Hetfield, Lars Ulrich, Kirk Hammett and Rob Trujillo will rock the Shark Tank for a good cause. The guitars used by Hetfield and Hammett during the performance will be signed by the members of the band, displayed on the concourse during the game and then donated to the Sharks Foundation to be auctioned off.

continued

Early in May of this year, they plaed the National Anthem at a San Francisco Giants game, watch below...