
Originally Posted by
rnkt
I think you meant bar 139, not 45. It is indeed great orchestration from Zelenka and a good example of how he injects further energy into already frantic music by shuttling figures between the violins. I believe there are nice examples of this type of orchestration in ZWV 14 (Josephi) which I personally feel was all a big experiment with "interesting" orchestration on the part of Zelenka. A good example is in the Osanna after the Benedictus. It is a fughetta, really quite a simple one by Zelenka's standards. But what it lacks in complexity Zelenka makes up for in terms of orchestration. Clearly he wants a massive crescendo through this short piece (it's only ~45 seconds long!) and so he gradually adds his instruments, the strings with the voices, then the wind, brass and drums. Just when you think he cannot crank up the energy any more he unleashes the 1st and 2nd violins to alternately double the pedal note of the basses, not on (boring) long notes but on semiquavers with the first semiquaver in each figure an octave higher. Just like in the part of Missa Votiva referred to by Rik1, the 1st and 2nd violins alternate this figuration, almost like they are battling it out to emphasis the pedal note the best. It is a remarkable moment which is from a tonal sense totally unnecessary (surely the basses can deal with the pedal note!) but leads to a shimmering texture which brings this short fughetta to a stunning climax. If you did not notice it before (it supports the overall texture so well the specific figure can be missed!) I strongly recommend a closer listen. The other case of alternating semiquaver unison figurations in ZWV 14 is in the totally batty Laudamus Te. That time it is octave semiquavers alternating between the violins and the violas.