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Are there opera parts for Horn that have transpositions lower than Bflat Basso? A Basso, A flat Basso and so on?
Kunitz (1961) lists 16 versions that were in use between 1800 and 1850, from C-alto (unison) through A-basso (minor tenth below notation) and gives examples for their use. So the answer seems to be "only the A-basso one".
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