Here is the UC Application center reply for another poster in regards to this issue:
The Visual and Performing Arts requirement states that a student must take a year long or two semester long courses in one of the four accepted disciplines of Music, Theatre, Dance or Visual Art. If the student opts to take two semester long courses they must fall within the same discipline. For example, a student can take a semester of Painting and a semester of Ceramics to fulfill the requirement. If they take a semester of Painting and a semester of Orchestra they will not fulfill the requirement as the courses do not fall into the same discipline.
If your school does not offer two semester long courses that fall into the same discipline there are alternate ways to fulfill the requirement. The website included below will detail the other ways to fulfill this requirement.
http://admission.universityofcalifornia.edu/freshman/requirements/a-g-requirements/index.html
If you find that you are unable to fulfill the requirement with any of the above options you can explain the reason why in the additional comments section. Please be aware that failure to fulfill all requirement will have a negative impact on your application.
If you have any other questions please feel free to contact us again.
I would like to note that as an applicant to any college, it is also your responsibility to make sure you meet the school requirements. You should not depend upon others including your counselor.
I wish you good luck.