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Trance
is a form of music best characterized
by quarter note drum patterns, and
16th/32nd note rhythm synthesizer
patterns. It has a meter of 4/4, with
a quarter note bassdrum acting as
metronome, and quarter note high-hat
hits on upbeats. This unwavering drum
mechanism may be constantly tweaked
with for effect, with the Attack,
Decay, Sustain, Release ( ADSR ) all
given liberal treatment. The tempo
is generally around 130-158 beats
per minute (bpm).
The arrangement consists mostly of a repeating 32nd note sequencing arpeggio , and a bass section of whole notes usually drifting through the aeolian or natural minor scale. Harmonic structure is typically minimalist, with often no more than 2-4 chords. Iterations of the i-iv-v progression (A minor, D minor, and E minor, for example) lend a dark feel by eschewing major chords entirely. Additional rhythm sections are added and subtracted every 16 measures (sometimes 8, and sometimes 32) to add weight and anticipation to the composition. The bass chord will usually change every 4 measures.
There is a lead synth, and it will be a simple minor scale melody of 8th notes, looping every 4 measures (some have 2, some have 8. Some even have 16). Trance is produced with keyboards , computerized synthesizers , drum machines , and music sequencer software connected via MIDI . The average trance song has a polyphony of 8. The most busy will have 16.
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