Hymn to St Cecilia, Op.

Opus number

An Opus number , pl. opera and opuses, abbreviated, sing. Op. and pl. Opp. refers to a number generally assigned by composers to an individual composition or set of compositions on publication, to help identify their works...

 27 is a choral

Choir

A choir, chorale or chorus is a musical ensemble of singers. Choral music, in turn, is the music written specifically for such an ensemble to perform.A body of singers who perform together as a group is called a choir or chorus...

 piece by Benjamin Britten

Benjamin Britten

Edward Benjamin Britten, Baron Britten, OM CH was an English composer, conductor, and pianist. He showed talent from an early age, and first came to public attention with the a cappella choral work A Boy Was Born in 1934. With the premiere of his opera Peter Grimes in 1945, he leapt to...

 (1913-1976), a setting of a poem by W. H. Auden

W. H. Auden

Wystan Hugh Auden , who published as W. H. Auden, was an Anglo-American poet,The first definition of "Anglo-American" in the OED is: "Of, belonging to, or involving both England and America." See also the definition "English in origin or birth, American by settlement or citizenship" in See also...

 written between 1940 and 1942. Auden's original title was "Three Songs for St. Cecilia's Day", and he later published the poem as "Anthem for St. Cecilia’s Day (for Benjamin Britten)".

For a long time Britten wanted to write a piece dedicated to St Cecilia for a number of reasons.