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Accompanies musically sans words, 4 letters

Ambient sounds, 4 letters

Bustles, 4 letters

Buzzes, 4 letters

Buzzes along, 4 letters

Close-mouthed singing, 4 letters

Doesn't know the words, 4 letters

Doesn't quite sing, 4 letters

Drones, 4 letters

Droning sounds, 4 letters

Forgets the words, maybe, 4 letters

Hi-fi annoyances, 4 letters

Indistinct sounds of mingled voices, 4 letters

Is abuzz, 4 letters

Is at a loss for words?, 4 letters

Is busy, 4 letters

Joins in wordlessly, 4 letters

Obviously doesn't know the words, 4 letters

Operates smoothly, 4 letters

Operates well, 4 letters

Performs musically sans words, 4 letters

Plays a kazoo, 4 letters

Purrs, 4 letters

Runs smoothly, 4 letters

Runs well, 4 letters

Runs well, as an engine, 4 letters

Sings along without words, 4 letters

Sings close-mouthed, 4 letters

Sings to oneself, 4 letters

Sings with a closed mouth, 4 letters

Sings without words, 4 letters

Sings wordlessly, 4 letters

Song sounds, 4 letters

Symptoms for a car mechanic, 4 letters

Works efficiently, 4 letters

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