In the 1950s, some jazz bandleaders began to replace the double bass with the then-newly invented electric bass. However, the electric bass made a big impact on jazz in the 1970s, with the advent of jazz rock and jazz fusion. The electric bass was much easier to amplify to stadium-filling volumes using large bass speaker cabinets and amplifiers than an upright bass. The electric bass also began to be used as an expressive solo instrument, as exemplified by the performances of Jaco Pastorius and Stanley Clarke.