My DD is in orchestra and she has an instrument to play in school. If we did not also have an instrument to practice on at home, her teacher would make sure she had access to the school instrument after school to practice.
There are not instruments in my DD's school. They do offer music lessons but you have to pay an extra fee for those as well as pay for the musical instrument (either purchase or rent). It also takes them away from some other classes so I have never looked into it. A lot of students take private/semi-private music lessons as an extra curricular thing.
Something I have learned on the DIS is that schools are so very different not only among regions and states but in towns too.