Goa and Pystrance

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Goa Trance is essentially "dance-trance" music (it was referred to as "Trance Dance" in its formative years), the original goal being to assist the dancers in experiencing a collective state of bodily transcendence, similar to that of ancient shamanic dancing rituals, through hypnotic, pulsing melodies and rhythms. As such it has an energetic beat, almost always in common time (4/4) meaning 4 quarter note pulses per bar. Time is marked with kicks (bass drum beats) on each quarter-note pulse, a snare or clap on the second and fourth pulse of the bar, with an open hi-hat sound every second eighth note. A typical track will generally build up to a much more energetic movement in the second half then taper off fairly quickly toward the end. The BPM typically lies in the 130 - 150 range, although some tracks may have BPMs as low as 110 or as high as 160. Generally 8-12 minutes long, Goa Trance tracks tend to focus on steadily building energy throughout, using changes in percussion patterns and more intricate and layered synth parts as the music progresses in order to build a hypnotic and intense feel.

Psychedelic trance has a distinctive, speedy sound. High BPMs (generally between 120 and 150 BPM) tend to be faster than other forms of trance or techno music. Psychedelic trance uses strong bass beats that pound constant throughout the song, and overlays the bass with varying rhythms using drums and other synthesized instruments. The different sounds and rhythms and beats generally change every 32 beats.<1> Psychedelic trance tracks tend to be 8-12 minutes long. This gives the music time to develop slowly, building up to a climax before breaking back down to rebuild again. Layering is used to great effect in Psychedelic trance, with new musical ideas being added on at regular intervals, often every 4 or 8 bars. This buildup will happen until a climax is reached, and then the song will break down and start a new rhythmic pattern over the constant bass line. Psychedelic trance also makes heavy use of the cutoff frequency control of the modulating filter on the synthesizer. Reverb is also used heavily, with large, open sounding reverb present on most of the lead synthesizers in the track.

I can't really tell the difference between the two, but apparently there is one.