Listen to The Young Person's Guide to the Orchestra, Op. 34: I. Theme. Brass online. The Young Person's Guide to the Orchestra, Op. 34: I. Theme. Brass is an English language song and is sung by Leonard Bernstein and New York Philharmonic Orchestra. The Young Person's Guide to the Orchestra, Op. 34: I. Theme. Brass, from the album Benjamin Britten: The Centenary Edition, Vol. 1, was released in the year 2013. The duration of the song is 0:18. Download English songs online from JioSaavn.