BUTLER, Charles. The Principles of Musik, in Singing and Setting; with the two-fold Use thereof [Ecclesiasticall and Civil], London, by John Haviland, for the Author, 1636, 4°, FIRST EDITION, woodcut title vignette, diagrams, one full-page, and printed music (some light soiling and staining), old wrappers. [STC 4196; Lowndes p. 333: "This tract, dedicated to King Charles I, was the only theoretical or didactic work on the subject of music, published in that king's reign"]