The best known choral piece by Brahms is his German Requiem. Since his teenage years he was involved with choral groups and continued to work with them throughout his life. He wrote numerous songs for a cappella ensembles as well as with accompaniment. The most familiar of these pieces is the Zigeunerlieder, op. 103. These Gypsy songs are usually performed by a soloist and piano, but were originally written for a quartet. This phenomenal recording by the Danish National Radio Choir highlights some of Brahms' work in the choral genre.