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 MEDIATYPE ( Name VARCHAR, MediaTypeId VARCHAR )
TABLE: CREATE TABLE TRACK ( MediaTypeId VARCHAR )

### Question ###
What is the least common media type in all tracks?

### Accurate SQL ###

SELECT T1.Name FROM MEDIATYPE AS T1 JOIN TRACK AS T2 ON T1.MediaTypeId = T2.MediaTypeId GROUP BY T2.MediaTypeId ORDER BY COUNT(*) LIMIT 1