Ever mindful of the accessibility of his works for amateur musicians, Mozart wrote, in a letter to his father, that his Piano Concertos Nos. 11-14 could be performed 'a quattro', with the accompaniment of string quartet rather than with full orchestra. Ignaz Lachner, a contemporary and associate of Schubert, saw great potential in chamber music arrangements and produced performing versions for piano, string quartet and double bass of many of the Mozart piano concertos. His considerable skill as a composer enabled these concertos, among them Nos. 18 and 22, to flourish in a more intimate setting.