<P> According to AllMusic: </P> <P>... until around 1967, the worlds of jazz and rock were nearly completely separate . (However, ...) as rock became more creative and its musicianship improved, and as some in the jazz world became bored with hard bop and did not want to play strictly avant - garde music, the two different idioms began to trade ideas and occasionally combine forces ." </P> <P> In 1969, Davis fully embraced the electric instrument approach to jazz with In a Silent Way, which can be considered his first fusion album . Composed of two side - long suites edited heavily by producer Teo Macero, this quiet, static album would be equally influential to the development of ambient music . </P> <P> As Davis recalls: </P>

Who is credited with creating the trumpet style in right hand piano playing technique