No half time is stuff like this but its probably better to call it all drum and base: https://soundcloud.com/noise-london/pessimist-livenoise-test...

In my experience drumstep tends to just be a cross between dubstep and DnB, whereas half-time is usually just DnB but at half the tempo. Some of it almost could be considered hip hop instrumentals but with the sound design of DnB. The two groups in that scene that come to mind are Ivy Lab and SHADES, though lots of DnB and IDM artists have half-time tracks (voljum, Noisia, Chee, Kursa, Seppa, and so on).

This is how I see it too - drumstep was basically dub/brostep sped up to d&b tempo, and with a few d&b stylings, whereas halftime is really doing d&b at half-time, often falling into dancehall and hiphop rhythms. They end up having some things in common, but coming at it from different angles.

I'm a big fan of a lot of stuff from Fixate, Fracture, Dr. Jeep, Ivy Lab, dBridge, Dub Phizix. None of these artists are exclusively in the genre, but they all have some great examples of this kind of music.

Shades and Ivy Lab, plus anything on 1985 Records that clocks in at 85 bpm.

for some good halfstep/halftime mixes, see https://www.youtube.com/results?search_query=f1rstpers0n+hal... and https://www.youtube.com/results?search_query=f1rstpers0n+hal...

and oooh has jump-up changed sonic properties since the time of Pendulum (let alone Aphrodite)..!

edit: newer jump-up mix examples: https://www.youtube.com/watch?v=WpUcmV6Mr-Y https://www.youtube.com/watch?v=gfaD8sYTmiU https://www.youtube.com/watch?v=2j-d_i_arYU

post-horns, fairly bassline influenced, sommit like that..