Taken literally, the question posed circumscribes a lot more than Broadway shows. I've done only a few of those, the most recent being Brigadoon as a sub for two performances. My show experience is a bit different. I've worked a lot of cabaret acts who bring their books with them for the house band. Some books are complete scores. Others are only folders of lead sheets. I prefer the latter when the house band is only a trio. It's not easy downsizing an orchestral score in real time. I worked for several years in the Rosie O'Grady's Goodtime Jazz Band in Orlando at Church Street Station. Four shows a night with various red hot mamas, song and dance men, Charleston dancers, tap and soft shoe dancers, can-can dancers, patriotic medleys, etc. Each show was unique, and you had to pull it in advance because the end of each number was followed immediately by the countoff for the next. We had a book of dixieland tunes, the basic show book, and books for each of the front acts, of which there were usually three different ones a night. These kinds of shows are a lot more grueling than working in a pit. An hour each of high-energy, fast-paced entertainment. Four different shows a night. Oh yeah, the band kicked off each set by sliding down a brass fire pole onto the stage. Never do that wearing polyester trousers.