In building up the heap a number of narrow vertical passages are left to afford a draught for the fire.
In some passages the poet seems to take delight in casting dramatic illusion to the winds.
Haydn finds the pianoforte so completely capable of expressing his meaning that he is at a loss to find independent material for any accompanying instruments; and the violoncello in his trios has, except perhaps in four passages in the whole collection of thirty-three works, not a note to play that is not already in the bass of the pianoforte; while the melodies of the violin are, more often than not, doubled in the treble.
He should therefore in all such passages play extremely lightly, so as to give the violin and 'cello the function of drawing the main outline.
But, when we look at the many passages in which the violas double the basses, we shall do well to consider whether there is room in the harmonic scheme for the violas to do anything else, and whether the effect would not be thin without them.