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

### Question ###
Which year has the most released song?

### Accurate SQL ###

SELECT groupyear FROM torrents GROUP BY groupyear ORDER BY COUNT(groupname) DESC LIMIT 1