Portrait of <a href="https://en.wikipedia.org/wiki/en:Master_Juba" class="extiw" title="w:en:Master Juba">Boz's Juba</a>, from an 1848 London playbill.
Unknown author<span style="display: none;">Unknown author</span>
<a rel="nofollow" class="external text" href="http://www.historycooperative.org/journals/cp/vol-04/no-01/cook/cook-5.shtml">Common-place: Dancing across the Color Line</a>.