Classical music is art music produced in the traditions of Western music, including both religious and secular music. The precise term also refers to the period from 1750 to 1820.

Electronic music is music that employs electronic musical instruments and circuitry-based music technology. A distinction can be made between sound produced using electro means.

Trance can be purely instrumental, although vocals are also a common feature. Typically they are performed by mezzo-soprano to soprano female soloists, often without verse.