Is it canon?

The classical music canon - who decides what's in and what's out? Can it and should it change?Bach, Beethoven, Brahms - widely regarded as permanent fixtures in the generally accepted canon. But what about the Chevalier de Saint-Georges, Louise Farrenc or Steve Reich?Tom Service looks at how and why certain composers and pieces of music became part of an established canon, and how things are changing over time, especially with the desire to see better representation of women and composers from more diverse backgrounds in the mix.With writer and historian Katy Hamilton and oboist and researcher Uchenna Ngwe.