Possible Clues:

• 'Empty orchestra'
• What you get in some bars -- strong Asian drink served up, all right?
• King advanced to face revolutionary Korea wannabes on show
• Small car with sloping angle gains nothing performing over track
• Bar staple
• Singing to recorded accompaniment
• Japanese entertainment, amateurs sing to recorded backing music
• Sing-along format
• Singing along to a machine
• Singing to recorded backing