| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| the first operas were produced around | 0.37 | 0.7 | 7224 | 72 |
| the first ever operas were written around | 1.86 | 0.2 | 2198 | 83 |
| the first operas were based on | 0.44 | 0.8 | 4088 | 34 |
| when were the first operas composed | 0.84 | 0.5 | 9022 | 38 |
| where were operas first performed | 1.35 | 0.7 | 9075 | 65 |
| the first operas were inspired by | 1.71 | 0.1 | 30 | 44 |
| the first opera was | 1.36 | 0.5 | 6259 | 7 |
| when were operas created | 0.57 | 1 | 9479 | 2 |
| what is considered the first opera | 0.88 | 0.2 | 2100 | 81 |
| the earliest opera was based on what | 1.63 | 0.2 | 1643 | 1 |
| opera was first introduced | 1.28 | 0.3 | 4626 | 77 |
| what was the first opera called | 0.76 | 0.3 | 1783 | 1 |
| first opera in history | 1.53 | 0.7 | 7129 | 3 |
| the history of opera | 1.96 | 0.6 | 1053 | 46 |
| how did opera begin | 1.08 | 0.8 | 6767 | 50 |
| how did opera originate | 0.69 | 0.5 | 695 | 54 |
| where was opera invented | 0.5 | 1 | 6756 | 15 |
