Metallica was easily the best, most influential heavy metal band of the '80s, responsible for bringing the music back to Earth. Instead of playing the usual rock star games of metal stars of the early '80s, the band looked and talked like they were from the street. Metallica expanded the limits of thrash, using speed and volume not for their own sake, but to enhance their intricately structured compositions. The release of 1983's Kill 'Em All ma! rked the beginning of the legitimization of heavy metal's underground, bringing new complexity and depth to thrash metal. With each album, the band's playing and writing improved; James Hetfield developed a signature rhythm playing that matched his growl, while lead guitarist Kirk Hammett became one of the most copied guitarists in metal. Lars Ulrich's thunderous, yet complex, drumming clicked in perfectly with Cliff Burton's innovative bass playing. After releasing their masterpiece Master of Puppets in 1986, tragedy struck the band when their tour bus crashed while traveling in Sweden, killing Burton. When the band decided to continue, Jason Newsted was chosen to replace Burton; two years later, the band released the conceptually ambitious ...And Justice for All, which hit the Top Ten without any radio play and very little support from MTV. But Metallica completely crossed over into the mainstream with 1991's Metallica, which found the band trading in their long compositions for more concise song structures; it resulted in a number one album that sold over seven million copies in the U.S. alone.