Rimsky-Korsakov begins laying a firm foundation for the proper treatment of the component parts of the orchestra by providing basic material on range and technique and on tonal quality of instruments in combination. He then proceeds to an instrument-by-instrument analysis and remarks on such technical matters as fingering, range, emission of sound, etc.; melody and harmony in strings, winds, brasses, and combined groups; a discussion of opera, solos, voices in combination, choral groups. 330pp. of musical excerpts.