Today I was listening to Schumann's piano concerto and once again I was awed at the pure glory of it. The first movement is really unusual because it was conceived as a Fantasie for piano and orchestra; Robert Schumann transformed it into a concerto at the instigation of his concert-pianist wife Clara, who premiered his works after his career as a pianist was spoilt by an injured hand. He added an "Intermezzo" and concluding Rondo, and the result was one of the most gorgeous concertos ever, if not the most.
Here is the beginning of the first movement, played by Amir Katz; as it is a very long piece, this version is split into six sections. Go to Youtube for the rest of them. It's well worth the half-hour it takes to listen to the piece.