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_202_54 ( id number, "song" text, "chinese" text, "hito radio\ntop 10" number, "9+2 music\ntop 15" number, "global asia\ntop 15" number, "ufo radio\ntop 15" number, "channel [v]\ntop 20" number, "mtv taiwan\ntop 20" number, "yes 93.3\ntop 20" number )

### Question ###
how many songs were on the mtv taiwan top 20 chart ?

### Accurate SQL ###

SELECT COUNT("song") FROM table_202_54 WHERE NOT "mtv taiwan\ntop 20" IS NULL