sentences:  Despite his lack of raw vocal power, Coates was still considered to be among the finest of English Wagnerian tenors, especially as Siegfried and Tristan, owing to the strength of his musicianship, his evident intelligence and his impressive deportment on stage.Before the First World War, he also appeared in London as Lohengrin, Tannhäuser as well as Tristan.He sang often in Wagner concerts and appeared as Parsifal in concert performances of the opera.