These titles have recently joined our reference collection.  In no particular order: 

The Times comprehensive atlas of the world.
This new edition includes prefatory sections on climate change, biodiversity, urbanization, the economy, and more. Shelved underneath the dictionary stand.

A chronological history of Australian composers and their compositions / researched, compiled, and edited by Stephen Pleskun.

Das große Lexikon der Violine : Baugeschichte, Spielpraxis, Komponisten und ihre Werke, Interpreten : mit 783 Stichwörtern sowie 117, zum Teil mehrfarbigen illustrationen und 21 Notenbeispielen / herausgegeben von Stefan Drees ; mit einem Geleitwort von Gidon Kremer.

Schubert. Lieder Register (Index). Neue Ausgabe sämtlicher Werke. Band 15.

Leonard Bernstein : a research and information guide / Paul R. Laird and Hsun Lin (2nd ed.)

Isaac Albéniz : a research and information guide / Walter Aaron Clark.

Catalogue raisonné of the Balinese palm-leaf manuscripts with music notation / Tilman Seebass ; with the collaboration of Hedwig I.R. Hinzler (RISM B:XVI)

Daniels' orchestral music / David Daniels. 5th ed.

Continuum encyclopedia of popular music of the world. Vol. 10: Genres : Middle East and North Africa.