B. Combination of Wind and Brass in Octaves
Doubling the horns in octaves by clarinets, oboes or flutes often replaces the combination
1 Trumpet
1 Horn (or 2 Horns) ] 8.
This is done when it is a question of introducing a rich tone into the upper octave which the trumpet is not capable of imparting. If a single horn is used, the upper part is allotted to 2 clarinets, 2 oboes, or 2 flutes. But if there are two horns playing the lower octave in unison, three or four wind instruments will be necessary above, especially in forte passages:
8 [ 2 Ob. or 2 Cl. or 2 Fl.
1 Horn as well as 2 Ob. + 1 Cl.
1 Horn ] 8; 2 Fl. + 2 Cl.
2 Horns ] 8.
To double a trumpet in the upper octave three or four wind instruments are required, but in the top register two flutes will suffice.
Wood-wind instruments should not be used to double a trombone in the octave above; trumpets are more suitable.