show stoppers is also a show choir competition (think GLEE), unless there is a separate dance only competition called Showstoppers I don't know about. I've taught show choir for 11 years. I would love to go see it, I've done showstoppers in the past, the only problem is it is a National competition and west coast show choirs are very different from mid west and Southern show choirs, in fact they have entirely different rules.
For examply west coast show choirs must have an acapella number and it must be at least 60 seconds long. Mis west (and I think southern too) don't have that rule but do have a mandatory mens only number and a mandatory womens only number, southern show choirs have a mandatroy dance only number.
So for a National show choir competition it si hard to confrom to others rules.