List the name of artists who have released albums and mixtape from 1980 to 1985 in "dance" genre.
albums and mixtape refer to releaseType; from 1980 to 1985 refers to groupYear between 1980 and 1985; tag = 'dance';
SELECT COUNT(T1.artist) FROM torrents AS T1 INNER JOIN tags AS T2 ON T1.id = T2.id WHERE T2.tag = 'dance' AND T1.groupYear BETWEEN 1980 AND 1985 AND T1.releaseType LIKE 'album' OR T1.releaseType LIKE 'mixtape'
CREATE TABLE IF NOT EXISTS "torrents"
(
    groupName     TEXT,
    totalSnatched INTEGER,
    artist        TEXT,
    groupYear     INTEGER,
    releaseType   TEXT,
    groupId       INTEGER,
    id            INTEGER
        constraint torrents_pk
            primary key
);
CREATE TABLE IF NOT EXISTS "tags"
(
    "index" INTEGER
        constraint tags_pk
            primary key,
    id      INTEGER
        constraint tags_torrents_id_fk
            references torrents,
    tag     TEXT
);
CREATE INDEX ix_tags_index
    on tags ("index");
