These are musicians playing pop or rock songs, they are very popular anyway, everyone knows the melody. Then there is a genre like jazz, and you rely heavily on improvisation.

In these cases, you will not be able to find the music stands used by the musician. However, for more formal music (such as classical classical music), the music can be long and complicated, and you need to put some sheets in front of you so that you can refer to it at any time.