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Progressive Trance
This trance is generally more laid back than Euro, it tends to be a lot deeper and has a less commercial edge. It is also usually slower (130 - 140 bpm) and has a wider variety of sounds - many progressive tunes use a lot of tribal techno and breakbeat sounds. The rifts in progressive music are much more subtle than that of Euro and never as uplifting. Progressive music relies more on subtle builds and drops guided by the DJ throughout the night, whereas Euro builds and drops in each individual tune. Recently much progressive trance has moved towards deep tribal sounds and breaks. This is often referred to as "progressive house".

Armin usually begins his ASOT shows with Progressive stuff (since they r slowe than tech and uplifting trance...he usually goes ascendingly in the tempo):)
Progressive Trance contains a lot of House elements, and it focuses more on Beats, Percussions, Bassline..Many prog tunes also contain nice melodies..Their breakdown is usually SHORTER than Uplifting Trance's breakdowns..
that's how i describe Progressive trance in my own words..
i hope this helped!

check ishkur's guide on EDM

http://www.di.fm/edmguide/edmguide.html

for me , progressive trance is defined in one compilation


MARKUS SCHULZ COLDHARBOUR SESSIONS 2004

Really ... one of the best mixed cds ever ! Dark , Dreamy , fluffy melodies , along with heavy basslines that will make you pass out , and some vocals to top it all off ... !

highly recommended !