Trance
Time Signature is usually 4/4 as that is the beat that people can dance to easier.
Between 120-150bpm. It tends to be faster than house music.
A 'four to the floor' drum pattern is normally used.
In trance music the mixing of layers distinctly shows a strong build-up and release.
They often have one strong, catchy melody line that is repeated throughout the whole song.
Fast Arpeggios and Minor Keys and Chords are used.
Drums and Bass are usually made electronically and often have a deep bass sound to them.
Reverb is usually used on claps or crashes at the end of bars/sections in the song to give a fading/blending effect. Low Pass Filters may be used on harmonic instruments to put more emphasis on the deep drum and bass parts.
Synthesizers are extremely common. Different presets or techniques may be used, so artists can change the sound of synths, using ADSR, Resonance, and Pitch.
Songs usually fade in/out so that artists can blend two songs together, in a compilation style.