| Rating | Solver | Clue |
|---|---|---|
| NONET | Singing group | |
| ALTOS | Singing group | |
| TRIOS | Singing group | |
| CHOIR | Singing group | |
| ABBA | Swedish singing group | |
| INSESSOR | One of the Insessores. The group includes most of the common singing birds. | |
| OSCINES | Singing birds; a group of the Passeres, having numerous syringeal muscles, conferring musical ability. | |
| SWIFT | ...destitute of complex vocal muscles and are not singing birds, but belong to a widely different group allied to the humming birds. ... | |