Aubrey had a very successful career, not only as principal horn player in several orchestras, but also as a soloist. He played Mozart’s Second Horn Concerto in 1923 at The Proms. His playing can be heard on several of the very early recordings when the LSO recorded for HMV. Several works were written for him, including the Concerto for French horn, Violin and orchestra by Dame Ethel Smythe. He played it very well, including the chords in the last movement (it is possible to play chords on the horn by humming one note and playing another note of the harmonic series). He played it at the Proms. The conductor Bruno Walter invited him to play it in Berlin. This made Aubrey the first British horn player to play a solo concerto abroad.