At an early age he ran a society of amateurs, for whom he wrote two symphonies and other vocal and instrumental pieces.
[1] In 1843, Warren was appointed organist of St Mary's Roman Catholic Chapel in Chelsea, London.
[1] Late in life Warren fell into poverty, and made piecemeal sales from his library, which included some significant early English manuscripts.
[1] With John Bishop of Cheltenham, Warren began in 1848 to issue a selection of Early Italian, German, and Flemish music for the Catholic Church, under the title of Repertorium Musicæ Antiquæ, of which two parts appeared.
[1] Masses and smaller works composed by Warren and performed at the services of St Mary's remained in manuscript.