His most noted composition was the song Ave Maria with accompaniment by piano, and violin obbligato.
He was a boy soprano, and at the age of 15 won a scholarship to the Royal College of Music, where he studied for four years under the organist and composer Walter Parratt.
[1] He also studied piano with Marmaduke Barton, and theory with Charles Wood and Walford Davies.
Kahn accompanied some of the great musicians of the day, including violinists Mischa Elman and Fritz Kreisler; sopranos Dame Nellie Melba, Luisa Tetrazzini, Florence Austral and Oda Slobodskaya, tenors Enrico Caruso, John McCormack, Richard Tauber, Vladimir Rosing, Joseph Hislop and Beniamino Gigli; and baritones Titta Ruffo and John Brownlee.
His Ave Maria was recorded in 1913 by Enrico Caruso and Mischa Elman, with the composer at the piano.