[jjulius]

In Psytrance, and dance music in general, most BPMs will stay the same throughout the track. You may have moments where the track will cut to half-time and "feel" slower, even though it's kinda not, but more often than not you're going to find that dance music tracks maintain the same BPM throughout.

DJs, however, will often be the ones switching the tempo up during a set, either slowly adjusting it up and down over the course of the night, or switching things up and suddenly bringing in a track at a completely different BPM.