Possible Clues:

• Jazz crooner Mel
• Mel of music
• Mel who co-wrote 'The Christmas Song'
• "The Velvet Fog" Mel
• Singer nicknamed "The Velvet Fog"
• The Mel-Tones lead singer
• Lifetime Achievement Grammy recipient of '99
• "The Christmas Song" co-writer Mel
• Velvety-voiced crooner
• 'Careless Hands' singer, 1949