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_21829580_1 ( average_grade VARCHAR, song VARCHAR )

### Question ###
Name the average grade for mar k tarkan

### Accurate SQL ###

SELECT average_grade FROM table_21829580_1 WHERE song = "Şımarık Tarkan"