I would be cautious about saying that the French colonists were less racist than the English. True, in Louisiana they were somewhat better, but Haiti was also a French colony. I think that, if the french had taken over the southern English colonies, it would have developed much the same. Economics and politics, not morals, were responsible for American racism, and I think those factors would be the same regardless. As far as the musical aspects go, I think that the language shift would stifle more traditional music than it fostered. Much of the English-language traditional music sung nowadays is from conquered nations like Ireland and Scotland. The French language doesn't have quite as many cultures that speak it.