

Mozart's "Romantic Sonatas" for violin and piano have uncertain authorship. The original autographs are missing, and the publisher, Breitkopf & Härtel, doubted their authenticity. Konstanze, Mozart's wife, offered the sonatas to the publisher in 1799, but they were disappointed and requested the original manuscript. However, it could not be found, adding to Konstanze's doubts.
The String Quintet No. 1 in B flat major, K. 174, was written by Wolfgang Amadeus Mozart in December 1773. Unlike Mozart's other viola quintets which are scored for two violins, two violas and cello- this early work is scored for two violins, two violas and basso.
Wolfgang Amadeus Mozart, Violin Concertos Nos. 3, 4, 5 for Violin and Piano Reduction, with cadenzas by Sam Franko (Nos. 3 and 5), Eduard Herrmann (No. 4) and Joseph Joachim (Nos. 4 and 5). Published by Schirmer's Library of Musical Classics.
Mozart's Sinfonia Concertante for Violin, Viola, and Orchestra in E-flat major, K. 364 (320d), was composed in 1779 during his tour of Europe. This piece is a cross-over of symphony and concerto and showcases Mozart's exceptional musical talent. The piece's three movements are filled with intricate melodies, harmonies, and rhythms that demonstrate the complexity and depth of the composition. Its average performance time is half an hour.