| The cor anglais and violin obbligato in the duet for male alto and tenor, Wie selig, with its thirds and lyrical highlights was particularly effective. |
| It is more baroque than the first in that for obbligato piano it substitutes real interchange between ripieno strings and concertino quartet. |
| You know that the performers do not sing, but declaim, and the music is like an obbligato recitative. |
| Acting as his lyre, he has two obbligato bass viols which creates a series of remarkable timbres. |
| He commissioned Mozart to write a trio with obbligato flute, which the latter promised to do. |
| It is not sung, but only declaimed, and the music is like an obbligato recitative. |
