Braille music is a special kind of writing that helps people who can't see very well or at all understand and play music. You know how you like to read books with your eyes? Well, some people can't read because their eyes don't work the same way as yours. But they can still read with their fingers!
In braille music, instead of letters like A, B, and C, there are different kinds of bumps and dots that tell people something about the music. For example, a dot might mean a certain kind of note, and a bump might mean a different kind of note. These notes tell people what to sing or play on an instrument like a piano or guitar.
And just like how there are different letters for different words in books, there are different kinds of bumps and dots in braille music for things like different notes and time signatures. So, people who read braille music can understand and play all kinds of songs, just like you can read all kinds of books!