horses... i guess
Yes. In fact, it is the Romans who developed the first domes in construction. The Pantheon is a marvel with it's dome.
Lead pipes is probably what you are looking for. Iron was used for weapons, armor, and farming tools.
In ancient Rome gold was used for jewelry, decoration, some dinnerware, and most important of all---MONEY!
Just about everyone used music in ancient Rome. There were street musicians and professional musicians who would work at theaters and private parties. The temples used music in some of their rites....