Claim: Opera includes a form of performance.
Evidence: Opera -LRB- -LSB- ˈɔːpera -RSB- ; English plural : operas ; Italian plural : opere -LSB- ˈɔːpere -RSB- -RRB- is an art form in which singers and musicians perform a dramatic work combining text -LRB- libretto -RRB- and musical score , usually in a theatrical setting.