http://iflastandards.info/ns/unimarc/unimarcb/elements/1XX/hasNumberOfInstrumentsOrVoicesEtcOfInstrumentOrVoiceNonsoloistConductorOtherPerformerOrDeviceNotIncludedInAnEnsembleInCodedDataFieldMediumOfPerformanceOriginalAlternativeMediumOfPerformance.en