The registered charity seeks to offer support and resources, such as performance and rehearsal spaces, to musicians who would not normally have such access.
The charity's chairman Sir Peter Lampl said the strong performance of some Asian countries could reflect cultural differences, adding that Chinese students often outperformed their classmates in Britain too.
Monday's royal performance is being staged in support of The Prince's Trust charity, and will see the Prince of Wales go backstage to meet the cast and crew.
Westerman was outstanding in an impressive performance from the Black and Whites - playing in a special pink kit for charity on the night - and his clean break set up Danny Tickle's first.
The Royal Film Performance is the main fundraiser for the Cinema and Television Benevolent Fund (CTBF), the trade charity for the UK film and television industries.