Related Clues:

• Sing sweetly
• Emulate a '40s singer
• Sing to a baby, maybe
• Emulate a ballad singer
• Sing slowly
• Sing to make people swoon
• Sing like Dean Martin
• Try Sinatra at karaoke, say
• Be a balladeer
• Emulate Tony Martin
• Serenade, maybe
• Sing like Anka
• Serenade softly
• Sing intimately
• Sing like Michael Bublé