release artist id
$meta_query = array( array( 'key' => 'release_artist_id', 'value' => '3306', 'compare' => '=', 'type' => 'NUMERIC', ), );
$meta_query = array( array( 'key' => 'release_artist_id', 'value' => '3306', 'compare' => '=', 'type' => 'NUMERIC', ), );