### Database Schema:
CREATE TABLE tags (
	index	INTEGER	NULL	PRIMARY KEY,
	id	INTEGER	NULL,
	tag	TEXT	NULL,
	foreign key (id) references torrents (id)
);

CREATE TABLE torrents (
	groupName	TEXT	NULL,
	totalSnatched	INTEGER	NULL,
	artist	TEXT	NULL,
	groupYear	INTEGER	NULL,
	releaseType	TEXT	NULL,
	groupId	INTEGER	NULL,
	id	INTEGER	NULL	PRIMARY KEY
);

### User's Query:
Please list the releases that have been downloaded for more than 20000 times.

### Extra Knowledge:
releases refer to groupName; downloaded for more than 20000 times refers to totalSnatched > 20000;
SELECT groupName FROM torrents WHERE totalSnatched > 20000