Sometimes
type: WorkPerformance
piano: http://data.carnegiehall.org/names/28018
unspecified voice: http://data.carnegiehall.org/names/7447
performer: http://data.carnegiehall.org/names/28018
performer: http://data.carnegiehall.org/names/7447
work performed: http://data.carnegiehall.org/works/16071