Not Strong Enough (feat. Brent Smith)

Brent Smith of Shinedown is the guest vocalist on this Diane Warren penned track. Apocalyptica drummer Mikko Siren explained the hook up: "We met Brent two years ago and we saw Shinedown live. We were really impressed with his voice. So when we had the song we remembered him, we asked him in and we were lucky enough that he agreed."

The song was released as the third single from 7th Symphony. However Smith doesn't appear on the US release of the single because the band didn't do the paperwork. Instead, the American single, which came out on January 18, 2011, features Doug Robb of Hoobastank.