Related Clues:

• Group to which the Y is often linked?
• Sequence found in this puzzle's five longest answers
• Basic quintet
• 'Wheel of Fortune' purchase menu
• Familiar fivesome
• Run of vowels
• Language quintet comprising the only elements in the circled boxes
• Introductory letters
• Group with a Y, sometimes
• Sesame Street quintet
• Run that sometimes includes Y
• Start of a traditional school song
• Lyric segment with the same melody as 'Twinkle, twinkle'
• Start of a common run
• First string?