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The Concert for Valor will air on HBO live from the National Mall in Washington, D.C. tonight beginning at 7 pm ET.

The concert features some heavy hitters of the rock world. Foo Fighters frontman Dave Grohl, The Black Keys, and Metallica, among many others.

In a video promo for the event, Grohl, alongside celebrities like Tom Hanks and Oprah Winfrey, asks viewers to take photos of themselves placing their hands over their hearts to honor American's veterans and service members and posting them to social media, tagging them with the hashtag #TheConcertforValor.

If you are not a subscriber to HBO, you will be able to view this special too.

Others artist performing at The Concert for Valor include Bruce Springsteen, country group Zac Brown Band, rapper Eminem and pop stars Carrie Underwood, Rihanna, Jessie J and Jennifer Hudson. Brown and Grohl have been recent collaborators -- he played on the Sonic Highways track "Congregation" -- so there's a possibility the two will join forces again during the special.