Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: 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?

### Accurate SQL ###

SELECT COUNT(music_by) FROM table_191105_2 WHERE performed_by = "Zachary Sanders"