- ONKEY
- Harmonious, as singing
- Singing accurately
- Like someone using 27-Across, probably
- Pitch-perfect
- Pleasing to the ear
- In tune
- Not discordant
- Correctly sung
- Not flat
- Harmonizing with the group
- Well pitched
- Properly pitched
- Good way to sing
- Neither flat nor sharp
- Not flat or sharp
- Pitched properly
- Pitched perfectly
- Not sharp at all
- Best way to sing
- Not sharp, say
- Like music to one's ears?
- Not sour
- Perfectly pitched
- Hitting the right notes
- Neither sharp nor flat
- True, as a tuba
- Musically accurate
- Musically correct
- Musically precise
- Tonally accurate
- Accurate, as a 19 Across
- At the right pitch
- Sound of sound
- Tonally true
- Pitched right
- Attuned.
- How to sing, ideally
- Like a good singer
- Perfectly pitched, musically
- Not flat, say
- Not at all sharp, maybe
- Pleasant to the ear, say
- How singers should sing
- Like good singing
- Harmonious, in a way
- Hitting the right note
- Suitable for the chorus
- Correct, pitch-wise
- Sung correctly
- Singing as one should
- Tonally pleasing
- Proper way to sing
- Correct way to sing
- Desirable way to sing
- Neither flat nor 6-Across
- Pitched well?
- Sounding right, in a way
- Great way to sing
- Sounding right
- Not pitchy
- Singing right
