There are several artists with that name. 1) Praxis was an ever-changing musical project led by prolific producer Bill Laswell. Praxis combined elements of different musical genres such as funk, jazz, hip hop and heavy metal into highly improvised music. The band first appeared in 1992 with the critically acclaimed Transmutation (Mutatis Mutandis), Laswell, guitarist Buckethead, keyboardist Bernie Worrell and drummer Bryan ''Brain'' Mantia have defined the direction of the band over the last 15 years.