Related Clues:

• Sound of contentedness
• Expression of contentment
• Baby bird call
• Imitate a cricket
• "I'm happy" in Siamese?
• Manx murmur
• Catnap noise
• Sparrow sound
• Car alarm acknowledgment
• Sound from Catwoman
• Smooth-running engine sound
• Desirable engine sound
• Sound engine sound
• Chick's call
• Music to a cat lover's ears