/**
 * Template Redirect
 * Use archive-artist.php for stage and day taxonomy archives.
 */
add_filter( 'template_include', 'custom_tax_template', 99 );
function custom_tax_template( $template ) {

	if ( is_tax( 'stage' ) || is_tax( 'day' ) ) {
		$new_template = locate_template( array( 'archive-artist.php' ) );
		if ( '' != $new_template ) {
			return $new_template ;
		}
	}

	return $template;
}