Possible Clues:

• The business school of City, University of London - or the mama of the Mamas and Papas?
• __ Elliot, singer with the Mamas and the Papas
• "Mama" Elliot
• Harriet __, former BBC radio announcer and newsreader
• Mama heard on the radio
• Mama of '60s music
• Mama ___ Elliot of 1960s folk
• Mama of folk rock
• Folk rocker McCombs
• Supreme Court Building architect Gilbert