If you are looking for something with a hip-hop type of beat to do a samba to you could try Wayne Wonder's "No Holding Back" or Sean Paul's "Get Busy". These both have interesting beats that work pretty well for samba. If you are looking for something that is more of an actual "samba" so to speak you could try something like "Rumbakaloa" which I think is done by Latinos on their Greatest Hits album. If you would like more suggestions let me know and I will dig through my collections!