Tintangel is a novel by Paul H. Cook published in 1981.
Tintagel is a novel in which people who lose themselves in music will disappear and reappear in a different parallel universe. [1]
Greg Costikyan reviewed Tintagel in Ares Magazine #13 and commented that "I cannot blankly approve or disapprove Tintagel. I enjoyed reading it, but it contains a number of logical errors – and never seems quite to click." [1]