I thought it was pretty unrealistic that each child/group of children would be taken out of class for a private music lesson. Talk about annoying for the teacher! Lots of class time would be missed and because it would be various kids missing it at various times, it would be really hard to catch up. This wouldn't happen in real schools. They'd most likely have a designated music period and stick to that.
I grew up playing the clarinet from 4th grade on and this is how we did music lessons in school, a few of us would meet for a private lesson with our band teacher during a period. Most of the other teachers weren't too fond of it LOL.
I owned this LS book, I got it in a boxed set of LS books for Christmas one year. As someone who was in band from 4th grade all the way through high school and college, this one pains me because it's SO inaccurate! First of all, a tiny 2nd grader would not be given a tuba. When my grade began band, the kids playing the lowest instruments were given the baritone horn, which is slightly smaller and lighter. They didn't switch to the tuba until maybe 7th grade.
Also, it wasn't "first come, first served" with instruments. In 3rd grade at my school, if we wanted to try out for band, we picked our top three instruments. Then, the music teachers would try us out on those and whatever ones they thought we were a good match for, we were assigned to. Like my first choice was the saxophone because I wanted to be like Lisa Simpson LOL. But I couldn't get any good sound out of it! So I ended up with the clarinet.
It was sweet they surprised Ms. Colman with Here Comes the Bride though. Those kids really loved her so much!