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 tags ( index number, id number, tag text )
TABLE: CREATE TABLE torrents ( groupname text, totalsnatched number, artist text, groupyear number, releasetype text, groupid number, id number )

### Question ###
What are the top 20 pop albums?

### Accurate SQL ###

SELECT T2.groupname FROM torrents AS T2 JOIN tags AS T1 ON T1.id = T2.id WHERE T1.tag = "pop" AND T2.releasetype = "album" ORDER BY T2.totalsnatched DESC LIMIT 20