what the hey is "trance dancing"?

Answer 1

an altered state of consciousness which accesses the magical realms of inner space. The trance dancer not only moves muscle and sinew to express the rhythms of music, but also through breathing and concentration, moves energy from the body's auric fields through the dancers on the dancefloor. In this way the trance dancer becomes an energy transducer, stepping down energy from the higher vibrational wavelengths of sound and light into etheric energy fields. So the trance dancer is able to inspire and energize others by means of the flowing movements and kinaesthetic energy s/he creates.

Answer 2

ditto