Blues rock started with rock musicians in the UK and the US performing American blues songs. They typically recreated electric Chicago-style blues songs, such as those by Muddy Waters, Jimmy Reed, Howlin’ Wolf, and Albert King, at faster tempos and with a more aggressive sound common to rock. In the UK, the style was popularized by groups such as the Rolling Stones, the Yardbirds, and the Animals, who placed several blues songs into the pop charts. In the US, Lonnie Mack, the Paul Butterfield Blues Band, and Canned Heat were among the earliest exponents and later “attempted to play long, involved improvisations which were commonplace on jazz records”. John Mayall & the Bluesbreakers and Peter Green’s Fleetwood Mac also developed this more instrumental, but traditional-based style in the UK, while late 1960s and early 1970s groups, including Ten Years After, Savoy Brown, the Climax Blues Band and Foghat became more hard rock oriented. In the US, Johnny Winter, the Allman Brothers Band, and ZZ Top represented a hard rock trend.