I think trance originated in germany, and it is hybrid of 'dance' and 'techno'.... not sure where the 'r' in trance comes from though.
try these:

http://www.rss-one.com/show-web-radio-42.html
http://radiotime.com/station/s_49585/1ClubFM_Trance.aspx

I listen to it usually when running/working out/cleaning

-David