Secondary notation

Secondary notation is a way of writing down extra information about some music that you're playing, like which part you should play, how loud or fast it should be played, or what kind of emotions you should express while playing it. It's like writing some extra notes on a piece of paper to help you remember how to play the music better.

For example, let's say you're playing a piano piece and there are two parts, one for the right hand and one for the left hand. Secondary notation might tell you which part to play first, how loud to play each part, when to speed up or slow down, or when to play more softly or loudly. This can help you remember the whole piece and how to play it in a way that sounds really good.

Overall, secondary notation helps musicians understand the music they are playing better and helps them make the right choices in how to perform it.