 The musicologist Ulrich Mazurowicz points out that the second half of the 18th century into the beginning of the 19th century was a period when string duos were printed more often than any other constellation including songs, operas, string quartets, music for orchestra or piano.Of all these string duos the major part was violin duos.Duo Gelland's continuous study of historic literature on music performance, theory and philosophy is a source of inspiration facing both their old and their new repertoire.