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 GENRE (GenreId VARCHAR, Name VARCHAR)
TABLE: CREATE TABLE TRACK (UnitPrice INTEGER, GenreId VARCHAR)

### Question ###
What is the average unit price of rock tracks?

### Accurate SQL ###

SELECT AVG(T2.UnitPrice) FROM GENRE AS T1 JOIN TRACK AS T2 ON T1.GenreId = T2.GenreId WHERE T1.Name = "Rock"