Yes
the Athens
IN the calculation of density
Gave a lot of land to Greece
Athens started math
The primary contribution in this regard is democracy.
they are famous in artistic architecture
putang ina moy
My butt was a great contribution.
The architecture and devious financial manoeuvring.
im sorry , did you mean what are three contributions of Greece to democracy? if so, it was Athens, (not all of Greece) who created democracy.
The most important contributions of ancient Greece to medieval music are probably the modes or ancient scales used in both. There is a link to an article on them below.