| Lacking backing |
| Without instruments |
| How Pentatonix sings |
| Unaccompanied, perhaps |
| Without instruments (8) |
| Barbershop quartet style |
| Like singing in a shower |
| With nobody playing, say |
| Lacking backing, in a way |
| Singing without instruments |
| Unaccompanied singing style |
| Like Pentatonix performances |
| Like singing sans instruments |
| Like some choral performances |
| With no instrumental accompaniment |
| Type of singing featured in "Pitch Perfect": 2 wds. |
| Music style endured in "Pitch Perfect" or "Your Friend's College Concert |