https://www.musical-u.com/learn/musicality-means-playing-from-a-lead-sheet/
Sometimes you’ll see musicians take out a big book containing literally hundreds of songs – or pass around a single sheet containing a whole song.
How is that possible when traditional sheet music can span several pages just for one piece?
The answer is they’re using lead sheets.
Being able to play a song just from a lead sheet or “fake book” is an important skill of musicality.
Check out this article and learn what a lead sheet is, and why and how to use them.