W.A. Mozart The young composer, a 1777 copy of a lost painting Piano Concerto No. 5 in D major, K. 175 ano Concerto No. 5 in D major, K. 175, was composed by Wolfgang Amadeus Mozart in 1773, at the age of 17. It is Mozart's first original piano concerto; his previous efforts were based on works by other composers. The work is scored for 2 oboes, 2 horns, 2 trumpets, timpani, a..