Help with infusion creation

$inf_newtable[1] = ARTISTS." (

artist_id INT(11) UNSIGNED NOT NULL AUTO_INCREMENT,

artist_name VARCHAR(70) DEFAULT '' NOT NULL,

artist_bio TEXT DEFAULT '' NOT NULL,

artist_record_company VARCHAR(150) DEFAULT '' NOT NULL,

PRIMARY KEY (artist_id)

) TYPE=MyISAM;";

$inf_newtable[2] = ALBUMS." (
artist_id INT(11) DEFAULT '' NOT NULL,
album_id INT(11) UNSIGNED NOT NULL AUTO_INCREMENT,
album_name VARCHAR(70) DEFAULT '' NOT NULL,
album_tracks SMALLINT(5) NOT NULL,
PRIMARY KEY (album_id)
) TYPE=MyISAM;";

$inf_newtable[3] = PLAYLISTS." (
playlist_id INT(11) UNSIGNED NOT NULL AUTO_INCREMENT,
user_id MEDIUMINT(8) DEFAULT '' NOT NULL,
playlist_name VARCHAR(70) DEFAULT '' NOT NULL,
playlist_date INT(10) DEFAULT '' NOT NULL,
playlist_modified INT(10) DEFAULT '' NOT NULL,
PRIMARY KEY (playlist_id)
) TYPE=MyISAM;";

$inf_newtable[4] = PLAYLISTS_ITEMS." (
playlist_id INT(11) DEFAULT '' NOT NULL,
track_id INT(11) DEFAULT '' NOT NULL
) TYPE=MyISAM;";

$inf_newtable[5] = TRACKS." (
track_id INT(11) DEFAULT '' NOT NULL AUTO_INCREMENT,
artist_id INT(11) DEFAULT '' NOT NULL,
track_name VARCHAR(70) DEFAULT '' NOT NULL,
track_url VARCHAR(150) DEFAULT '' NOT NULL,
PRIMARY KEY (track_id)
) TYPE=MyISAM;";