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XML is fine. Schema validation is really handy more often than you’d think.

You can do schema validation with other formats too.

For example you have JSON Schema, that many people experience through Kubernetes.

Probably a relic of the musicxml format which still holds some popularity in programs based around sheet music/western notation

On the subject of MusicXML, there is currently ongoing work to develop a successor (currently named MNX): https://w3c.github.io/mnx/docs/

What would you propose? Json?

easy to parse, supported by basically anything and not a shitty format like YAML for example

Why not?