Related Clues:

• Quintet followed by '... and sometimes Y'
• Alternative lyrics to 'Twinkle, twinkle'
• 'Wheel of Fortune' purchase options
• Front four?
• ''Wheel'' purchase choices
• Sequence found in this puzzle's nine longest answers
• Quintet to which 'y' is often added
• Four starters
• Vocal quintet?
• Group seen in gathering clouds?
• Language quintet
• Sometime colleagues of Y
• Things that rhythm lacks?
• Common exam choices
• It's sung to the same tune as 'Twinkle, twinkle'