Possible Clues:

• Modern dancehall of youth
• Thumping music producing some discomfort
• Public dance hall with recorded music
• Place to dance to recorded music
• A dance very lacking in invention
• Club with dancing to recorded music
• 70's 'in' spot
• It will make only a shade of change to the dancing there for it to lour
• Sidney gets back to the company for entertainment
• Dance genre