Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_191105_2 (music_by VARCHAR, performed_by VARCHAR)
### Question:
When zachary sanders is the performer how many people is the music by?
### Answer:
SELECT COUNT(music_by) FROM table_191105_2 WHERE performed_by = "Zachary Sanders"