Tens of musical manuscripts, mostly in Lachman's handwriting, some with his own tunes and others with mention of composer's name, such as Lavandovsky and Aharon Freidman. It is possible that some of the handwritings are not Lachman's.
About 150 leaves from various periods, all with Jewish tunes.
The collection was not researched musically, but it can be assumed that some of its tunes were never publicized.
Sizes and conditions vary.

Fest Cantate zum Funf und Zwanzigiährigen Amts-Jubiläum des Herbn Louis Lewandowski. Musical composition for soloists and choirs, by Isidor Rosenfeld.
Dec. 13th 1865. Handwritten on paper, presented as gift to Cantor Louis Lavandowsky, marking 50th anniversary of serving as cantor.
Louis (Eliezer) Lewendowski (1821-1894), cantor, choir conductor and composer of music for synagogues. Served as chazzan and choir conductor in the new Synagogue of Berlin. His works are considered until today fundamental to Jewish music, many great cantors were his disciples.
Many of Isidor's compositions have been publicized and are still sung today (also by Birenbaum), but this composition has never been publicized.
Manuscript without corrections, very pretty and clean. Contained in original velvet case with gold embossings, made by A. Littaner in Berlin. Inner binding is covered with cloth. Gold edging.
[6], 130 pages, 33.5 cm. Binding damaged in front, corners and spine, slightly bent.

Melodien zu dem Israelitischen Gesangbuche, S. Blumenau. Melodies from the Hebrew Prayerbook, S. Blumenau. Author's publishing (place note mentioned), [1879?].
37 pages, 17x21 cm. Good condition. Library ink-stamp. Worn and slightly detached cardboard binding.