here a few links to the main cultural sites in Rome:

home page of the city's cultural dep. Infos on cultural activities sponsored by the city, museums etc. Unfortunately their english pages are not working, but then you can also test your italian ;-)

one of the most important classical music concert association in Italy and in Europe as well

The Auditorium Parco della Musica newest and largest concert hall. A great place with performances ranging most musical styles, dance, theatre and much more.

Rome's Opera house: opera and ballet program