MODEL 181 BACH CORNET IN Bb Because of its two windings and more conical bore, this instrument has more resistance and flexibility. Best suited for coloratura work, slurring, triple tonguing, and other technical performances. The tone is smooth and not as heroic or martial as that of the Bb trumpet. Available in three bore sizes (M, ML, L). The large bore model, having a more mellow and richer tone, is frequently used for melody playing.