Related Clues:

• Start of a kindergarten song
• Kindergarten song starter
• Start of a preschool song
• D followers
• Introductory letters?
• Starting four
• First four of a series
• D-I linkup
• Letter openers?
• What I must follow
• Start of an old school song
• Alphabet start
• Opening foursome
• Alphabet opener
• Start of a tots' song