When we launched, we intentionally didn't exhaust our back catalog. This has given us a chance to go back later, to post some total classics ex post facto. Pretty much everything on the Metallica black album qualifies as a total classic.
Celldweller's debut album probably has eight tracks you should have in your workout playlist. And this right here is probably the most totally asskicking of the lot. Play it when you're mad at something, and want to take it out on your body fat.
Definitely Flyleaf's best song - which is quite saying something - until they released their second album. Begins with the couplet: "You can only move / As fast as / Who's in front of you" - that'll get you moving! This tune is huge, plus inspiring.