In some locales, community theater groups put on a number of productions with live music.
Typically, the theater group will lease the rights to put on a production for a limited run. Those rights include limited copies of the music associated with the show. The group’s Music Director hires the musicians, and distributes the “books” of sheet music to them.
These books are only provided for the specific time accorded the production. It usually includes a specific time frame for rehearsal, plus the dates the show will be performed before an audience. These books of sheet music are provided as “clean copies”; NO notes from previous productions of the show are permitted to be left on the books when they are returned. If they aren’t returned “clean”, financial penalties are assessed to the production’s officers - and they can be severe and expensive.
The Music Director usually puts the Fear Of God in the musicians about this , and insists that all of them have a) a number of #2 or softer pencils to be on hand at ALL TIMES, and b) a kneadable eraser to be used to erase all of the (copious) notes the Music Director tells you to make on your part(s). After the production wraps, you go home after the wrap party and erase ALL the notes before turning your book in the following day.
I’ve done this a few times. Lots of pressure, lots of fun, lots of woodshedding, and you are improved as a musician in so many ways by doing it. I highly recommend the experience.