| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| when were instruments invented | 0.2 | 1 | 6588 | 70 | 30 |
| when | 0.43 | 0.3 | 7403 | 30 | 4 |
| were | 0.31 | 0.7 | 6217 | 81 | 4 |
| instruments | 1.98 | 0.5 | 9262 | 100 | 11 |
| invented | 1.7 | 0.6 | 4894 | 48 | 8 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| when were instruments invented | 0.02 | 0.3 | 9645 | 3 |
