Here is a link to a helpful article published by the National Federation of the blind (a primarily American based blindness organisation).
The article is a compilation of different Braille music resources, which range from educational residential trips focused around learning Braille music, to braille and print Music score converters.
Please note that as the NFB is a US-based organisation, some of these resources will be tailored to people living in the US. You will need to check that the resources are relevant to your country.
https://nfb.org/resources/braille-resources/braille-music-resources