||Matta, João da
||Mixed Chorus, Flute, Clarinet B♭, Trumpet B♭, 2 Horns in F, 2 Trombones and Strings
Is this by J. Francisco da Matta (early 20th century apparently?, the flute part (only) of a D major Stabat Mater "por João Francisco da M." is in the archives of Laboratório de Musicologio do Departamento de Música da Escola de Comunicação e Artes da Universidade de São Paulo according to RISM online, e.g.), or is it J. Eduardo da Matta Jr. (1850–1928), J. Antonio da Matta (ca.1814), or J. Pedro da Matta (18th century)? Lacking any information on that, where is the source (if someone downloads one of your typesets it should say, based on this or that (manuscript/public domain publication/...)) etc.?