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 track ( Track_ID int, Name text, Location text, Seating real, Year_Opened real )
TABLE: CREATE TABLE race ( Race_ID int, Name text, Class text, Date text, Track_ID text )

### Question ###
Show the race class and number of races in each class with a bar chart, and list by the y-axis from high to low.

### Accurate SQL ###

SELECT Class, COUNT(*) FROM race GROUP BY Class ORDER BY COUNT(*) DESC