I am lukin for some top DUEt soothing songs like beyonce feat timberlake(until z end of time),songs like zat ?

Ozer calm n top duets r morrison feat nelly furtado(broken strings),t.i feat timberlake(dead n gone),or timbaland feat nelly furtado(promiscuous gal)....Can i get z list n suggestions of ozer top duet songs??thx