Possible Clues:

• Pub entertainment with singing to backing recordings
• Singing of songs over recorded backing tracks
• Pub entertainment said to give US statesman a lift
• Often cringeworthy and drunken singing to a video tape
• Entertainment singing to recorded backing tracks
• Amateur songfest
• Pub entertainment in which customers sing to backing tapes
• Sing-along entertainment
• Offering at some bars
• Bar staple, these days