Then he became a staff member of the orchestra at Covent Garden where he played for the conductor composers Granville Bantock, Edward Elgar, Samuel Coleridge-Taylor, and Hubert Parry.
Denton was invited to Portland, Oregon, to be organist at Trinity Episcopal Church, where he served from 1901 to 1910.
He submitted his resignation as conductor on January 17, 1925 and his final conducting engagement was on May 20, 1925 at the Municipal Auditorium; a concert which included Samuel Coleridge-Taylor's cantata A Tale of Old Japan.
At his request, he retained the post of conductor of the Portland Symphony Chorus, which was largely of his making.
After her death on September 7, 1953, he later moved to Seattle, Washington, to live with his son James C. Denton.