query_posts('listing_category=musician');
if (have_posts()) : while (have_posts()) : the_post();
$posttags = get_the_tags();
if ($posttags) {
foreach($posttags as $tag) {
$all_tags_arr[] = $tag -> term_id; //USING JUST $tag MAKING $all_tags_arr A MULTI-DIMENSIONAL ARRAY, WHICH DOES WORK WITH array_unique

}
}
endwhile; endif;

$tags_arr = array_unique($all_tags_arr); //REMOVES DUPLICATES
foreach($tags_arr as $tag) {
$includeTags = $tag.',';
}
$args = array('include'=>$includeTags);
wp_tag_cloud( $args );