An introduction to the skill of musick : in three books the first contains, I. The grounds and principles of musick according to the gamut, being newly written, and made more easie for young practitioners, according to the method now in practice, by an eminent master in that science, II. Instructions and lessons for the treble, tenor, and bass-viols, and also for the treble-violin, III. The art of descant, or, Composing music in parts, made very plain and easie by the late Mr. Henry Parcell /