single tag title won't display in sidebar?

<li id="recent-posts" class="widget">
<h4>Latest Business</h4>
<ul>
<?php query_posts('showposts=10&cat=-1'); ?>
<?php while (have_posts()) : the_post(); ?>
<li>
<a href="<?php the_permalink() ?>"><?php the_title(); ?></a> - <?php single_tag_title(''); ?> <?php
foreach((get_the_category()) as $cat) {echo $cat->cat_name . ' ';} ?>
<?php if( get_post_meta($post->ID, "phone1", true) ): ?>
<br />Phone: <?php echo get_post_meta($post->ID, "phone1", $single = true); ?>
<?php else: ?>
<?php endif; ?>
</li>
<?php endwhile;?>
</ul>
        </li>