California State Board of Education:
https://www.cde.ca.gov/
Current (Old) Standards:
https://www.cde.ca.gov/be/st/ss/.
New California Arts (VAPA) Standards:
https://www.cde.ca.gov/be/st/ss/vapacontentstds.asp
National Core Arts Standards
Review the National Core Arts Standards: A Conceptual Framework for Arts Learning (especially Section I, pages 8–16, which includes a discussion of enduring understandings and essential questions)