A great way to hear clips of various artists and songs is to do a search on CDNOW.com, which has many, many available to listen to (just enough of the song to get you to want to buy the album). I went there to look for the Carters and found several. Here's an album that has some clips by Anita (just copy and paste into the address bar):

http://www.cdnow.com/cgi-bin/mserver/SID=1036419992/pagename=/RP/CDN/FIND/album.html/ArtistID=CARTER+FAMILY/itemid=644268