I really enjoy Martyn Bennett’s works. He is someone I wish I could have met. Here is his website, which his mother Karl Mariner is still maintaining. He helped forge the Celtic Fusion sound. You can hear soundclips from his albums, as well as watch videos on the media -> videos page. I really like the third video, (6/08 ETA: It is currently the fourth video there now. The one played at King Tut’s Wah Wah Hut is the one I mean.) the song is “Spree” from his album Hardland. One of my favorite songs by him is still “Tongues of Kali”. If I had to choose a theme song for myself, that would most likely be it. I recently read Myths and Legends of Our Own Land on Project Gutenberg and enjoyed it. I’m reading Folklore and Legends Scotland next.
ETA: Apologies for the exceedingly tardy correction.