7. _National Music._--All the collections of national songs and dances which have been published in different countries. The advantage which the musician might derive from a careful study of them is not yet so fully appreciated as it deserves; but it would probably soon be better understood, if these treasures were made more easily accessible. 8. _Books of Instruction for Vocal and Instrumental Practice._--The best books for every instrument, as well as for the voice, which have been published in different countries and languages. 9. _Works on the Theory and History of Music._--All the standard works ought to be found in the library, not only in the languages in which they were originally written, but also in translations, if any such exist. Many of the latter are valuable, on account of the explanations and other additions by the translators. This is, for instance, the case with some English books which have been translated into German; as Brown's 'Dissertation on the Rise, Union, and Power of Music,' translated by Eschenburg; 'Handel's Life,' by Mainwaring, translated by Mattheson, etc. It need scarcely be added that the biographies of celebrated musicians ought also to be included among the desirable requisites. 10. _Works on Sciences intimately connected with the Theory of Music._--Treatises on acoustics, on the construction of musical instruments, on Êsthetics, etc. 11. _Musical Journals._--All the principal ones published in different countries and languages. To these might advantageously be added the most important literary journals containing critical and other dissertations on music. 12. _Dictionaries, Catalogues, etc._--The English language possesses no musical dictionary, technical, biographical, or bibliographical, similar to the French and German works by FÈtis, Schilling, Gerber, Koch, Rousseau, and others, which are indispensable for the library. With these may be classed the useful works on the Literature of Music compiled by Forkel, Lichtenthal, and Becker, as well as Hofmeister's comprehensive 'Handbuch der musikalischen Literatur.' The collection of catalogues should comprise all those of the principal public musical libraries on the Continent and in England; those of large and valuable private libraries, several of which have appeared in print,--as, for instance, Kiesewetter's 'Sammlung alter Musik,' Becker's 'Tonwerke des XVI. und XVII. Jahrhunderts,' and others; those of the principal music-publishers, and those of important musical libraries which have been disposed of at public auctions.