Famous work of the 'Newer Classic' and also considered 'the mother of program music', this consists of eleven pieces. The four (sometimes three or five) variations of the "Promenade" theme, the best known part, serve as imaginary walks from one painting to another. Originally composed for piano, Maurice Ravel's orchestration made the work famous and one of the most performed late classical works. There are also organ, electronic/synthesizer and horn interpretations, and many performances alter the original order of the pieces.