They offer such interesting blends of timbre that one wonders why they have become so rare on concert stages in the meantime: Songs that are accompanied not only by the piano, but also by another instrument. In order not to compete too much with solo singing, instruments in the middle voice ranges are suitable for these trio songs, such as viola or horn in this production. In the first half of the nineteenth century, the genre was so popular that even composer-celebrities such as Franz Schubert and Johannes Brahms made individual contributions; but many were also written by little-known or even unknown colleagues, among whom there are many a hidden gems to be discovered. The quartet Burkhart / Koch / Lamotke / Kaldewei has recorded works by František Škroup, Wilhelm Kleinecke or Heinrich Proch for the first time and provides a real enrichment of the repertoire.