Today (22 Nov) is the feast day of St. Cecilia, the patron saint of musicians,
and the church dedicated to her in Trastevere has foundations going all the way back to the 3rd century,
with beautiful later construction marking every era in the development of the Church.
It has been used as a Benedictine convent since 1527.
https://en.wikipedia.org/wiki/Santa_Cecilia_in_Trastevere
The nuns have a modest web page that lists visiting hours, but I'm wondering if there are any guided tours in English that can help us appreciate the great art and architecture of this location.
http://www.benedettinesantacecilia.it/htm/info%20e%20contatti.htm
I noticed in the trivia about St. Cecilia that she used to be on the back of the 20-pound British banknote pre-2010.