Original: The old valveless horn was barely capable of playing in B-flat minor; the only example found in 18th century music is a modulation that occurs in the first minuet of Franz Krommer's Concertino in D major, Opus 80.
Simplified: The old valveless horn could not play easily in B-flat minor. In fact, the only example found in 18th century music is a modulation in the first minuet of Franz Krommer's Concertino in D major, Opus 80.