Ellis's 1959 recording of Handel's harp concertos (with Thurston Dart) won the Grand Prix du Disque. In 1962, the Melos Ensemble with Ellis released what is considered by musicologist Paul Loeber the finest rendition ever of Ravel's "Introduction and Allegro", playing with flautist Richard Adeney, clarinettist Gervase de Peyer, violinists Emanuel Hurwitz and Ivor McMahon, violist Cecil Aronowitz and cellist Terence Weil. The record, released on the L'oiseau-Lyre label, OL 50217, included works by three other French composers — Debussy: Sonata for Flute, Viola and Harp; Albert Roussel: Serenade for Flute, Violin, Viola, Cello and Harp; and Guy Ropartz: "Prelude, Marine and Chansons" for Flute, Violin, Viola, Cello and Harp. He also took part in the ensemble's recording of Peter Maxwell Davies's cantata "Leopardi Fragments".