From Wiktionary, the free dictionary

From jazz +‎ -step (“denoting a genre of electronic dance music, especially one influenced by drum and bass”).

jazzstep (uncountable)

1. (music) A genre of electronic dance music which combines elements of drum and bass and jazz.

   • 1997 August, Tim Haslett, “Bristolian Renaissance”, in CMJ New Music Monthly, volume 48, page 50:

     Tracks such as "Stoned Love" and Die's "Reincarnations" effect a nearly perfect synthesis of Alex Reece/Wax Doctor-esque jazzstep and the rumbling hardstep styles exemplified by outfits like DJ Recordings and Renegade Hardware.

   • 2015 May 12, Xilent [Eryk Jerzy Kowalczyk], quotee, “Xilent on crossing genre boundaries and working with some of the biggest names in pop”, in MusicRadar‎^[1], archived from the original on 15 June 2021:

     I was around 19 when I heard about more VST instruments like Massive and FM8, and the first track I actually made after the punk rock phase was this jazzstep jungle song - a liquid funk piece that was so badly done; the drums were just a loop I found online and so on.

   • 2015 August 24, “The 200 Best Songs of the 1980s”, in Pitchfork‎^[2], archived from the original on 15 December 2022:

     In wistful instrumental stretches the song slides into an extended keyboard solo of unexpected (even for Womack & Womack) minimalism and economy, a slow jazzstep in zero gravity.

   • 2018, Bill Kandiliotis, The Blood Ring, →ISBN:

     Jazzstep plays in the background, a five-year-old classic, 'Gyrating to the Rhythm' by Two Evil Uncles.