Avoid sharing equipment unless equipment can be properly sanitized between use by multiple students.
Clubs and before/after school ensembles should follow normal school protocol and scheduling if allowed to function and meet.
Follow scientific recommendations for singing and playing instruments indoors. If recommendations necessitate mitigation strategies, consider the following work that can be done in class in large group:
Static skills (body percussion, non-locomotor movement, etc.)
Visual and Aural Analysis of Music
Social Emotional Learning through Music
Go ahead and assume no singing for the semester unless you can go outside and social distance that way.