Last.fm are finally cleaning up their metadata, or at least they have started. If you are on last.fm, why don’t you help out by voting for Rodolpho Biagi to redirect to Rodolfo Biagi? (follow the link to faulty spelling, vote at the bottom right). And while you are at it, if you are also a tango dj, why don’t join the group tangodj?
Information on tango music has gotten better lately, and a sample from top Pugliese tracks seems reasonable: