Maybe the phrase should be "They don't call it a singers night. They call it Karaoke". Singers night is generally a misnomer as most people at most singers nights I have been to also play an instrument. Most often the guitar. At a Karaoke night the performers are just singers! OK, they are accompanied by an electronic soundtrack but they are still purely singers rather than singer/instrumentalists and at least they are not usually intent on a 10 minute intro to a five minute song or giving the audience the benefit of their innermost feelings. I have never done Karaoke but I find it pretty absurd and elitist the way that those who do are sneered at by the 'real' singers :-(