are there any foundations that would give a grant to a school?

The best resource for this is Foundation Center http://www.fdncenter.org/ . They have a very good database covering all organizations giving grants and you can find foundations that are interested in supporting your type of cause. However, it's a subscription based website ($19.95 per month I think is the cheapest subscription price). But it certainly is worth the fee. You can subscribe one month, and make sure you get all the info you need and then stop the subscription.

Foundations have funding priorities and give money to those applicants whose needs fit those priorities well. There are a number of foundations which give money to schools, but you would need to find a foundation which wants to foster the performing arts in schools (or maybe one which wants to encourage low-income students, if your school fits that description).

Check with your scholarship office or Alumni office. Usually the foundations are already established and one of them should be able to tell you if they have such a grant in that department.