'Robin Hayward, an extraordinary tuba player, offered a riveting account of Luigi Nono's Post-prae-ludium per Donau' - The New York Times (from review of Metropolis Counterpoint Berlin concert, Carnegie Hall, November 2007)
Some passages of Luigi Nono's Post-prae-ludium per Donau may be seen as foreshadowing the microtonal tuba, and the piece was in fact originally written for an F tuba similar to the one that Robin Hayward has adapted specifically for microtonal tunings.