Related Clues:

• Letter sequence
• B-F connection
• B-to-F string
• String before F
• Queue after B
• Part of a kindergarten song
• From B to F
• The third to the fifth?
• Follow-up to F
• F preceders
• Start of a musical scale
• Musical scale trio
• Start of a basic scale
• Do re mi, perhaps
• Start of a basic piano lesson scale