Lochamer-Liederbuch
"Fundamentum organisandi" redirects here. For other manuscripts that contain didactic compositions under this name, see Buxheim Organ Book and Fundamentum of Hans Buchner.
The Lochamer-Liederbuch double source (also referred to by its shelf-mark, D-B Mus. ms. 40613) contains, along with several polyphonic German Lieder, a sizable collection of early keyboard repertoire dating from the 1450s. It is associated with the blind organist-composer Conrad Paumann.
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References
Online facsimile: digital.staatsbibliothek-berlin.de, accessed 27 September 2023. Mirrored at IMSLP.
Southern, E. (1962). The Buxheim Organ Book. Brooklyn, Institute of Mediaeval Music.
Young, W. (1962). Keyboard Music to 1600 I. Musica Disciplina, vol. 16.