Question: Who known as a London-based rock vocalist with Mike + The Mechanics, Tim Howar or Demis Roussos?
Sentence (from "Demis Roussos"): Artemios "Demis" Ventouris-Roussos ( ; Greek: Αρτέμιος "Ντέμης" Βεντούρης-Ρούσσος , 15 June 1946 – 25 January 2015) was a Greek singer and performer who had international hit records as a solo performer in the 1970s after having been a member of Aphrodite's Child, a progressive rock group that also included Vangelis.
Relevant evidence: Yes