Trance, along with drum and bass, is one of the newer additions to the dance music family tree. It developed out of early '90s techno, and has since split off into two distinct strains -- psychedelic (or Goa) trance and progressive house. The up-tempo, heavily electronic, swirling sounds of psychedelic trance can be heard booming from sound systems along the coastline of southwestern India, particularly Goa -- hence "Goa trance." Meanwhile, progressive house (a lighter derivative) is the music of choice in the both the burgeoning U.K. indoor club scene and the sun-drenched beaches and clubs of Ibiza. You cannot discuss progressive house without mentioning Sasha, John Digweed, Paul Oakenfold, and Nick Warren, all of whom have attained pop-star status in their native England.