Nevertheless the piece requires highly trained musicians .
Some critics have claimed that an ensemble formed of ten winds and only five strings is inherently unbalanced ; however , some of the voices are doubled so that no instrument is playing one - on - one against another .
The piece requires highly trained musicians .
Some critics have claimed that an ensemble formed of ten winds and only five strings is inherently unbalanced ; however , some of the voices are doubled so that no instrument is playing one - on - one against another .