Led Zeppelin's second album was recorded during the group's first year on the road. It's the sound of a band coming together as a unit and developing their own style. The blues rock of the first disc is still there, but it has a harder edge this time around. The lead track "Whole Lotta Love" quickly became their signature song, while "Ramble On" and "Heartbreaker" rank among the finest work of their career. What's more impressive is that the disc was recorded in a series of fits and starts during their tour. On days off they'd set up shop at a local studio, and then pack everything up and start again when they had time. It's a very tough way to make an album, yet the disc sounds totally cohesive. We're sure some of you don't see this as a metal album. The voters felt otherwise.