This time musicrobot brought the MidiTeca site which has a very good version for piano, violin and bandoneon:

www.geocities.com/Baja/3061/tango.html

Note that there are many versions of tangos in the net. One group is the Euro-American style (which in my humble opinion is a grotesque military march for dancers to walk rigidly across the room with a rose in their teeth) and the other is a sensual, seducing dance of turns and cadences which is the original tango from Argentina and Uruguay. I am in favor of the original, as in everything :))

Un abrazo - Andrés