At club's karaoke night, Kaiser Chiefs singer takes to the stage

In front HE is used to performing of tens of thousands of adoring fans.

But Kaiser Chiefs frontman Ricky Wilson took to the stage of an Edinburgh nightclub in front of a slightly more subdued audience – with most of them not having a clue who he was. The singer joined in at a live band karaoke night at the city's Electric Circus venue on Market Street, but instead of drawing attention to himself, he filled in a request slip under the pseudonym Brett Sinclair.Even when he took to the stage for his first tune – Frank Sinatra's Fly Me To The Moon – his presence went relatively unnoticed amongst customers, who thought he was just another karaoke-lover.The venue's live band, The Bearded Ladies, however, knew exactly who he was and when the singer went up to sing a second number – Mustang Sally – they then followed it by asking him to perform one of the Kaiser Chief's biggest hits, I Predict A Riot.Staff – who knew who the mysterious performer was – said customers gradually started to put down their drinks and gather round the stage after hearing the frontman's "version" of the Kaiser Chiefs' classic, and slowly but surely they discovered who he actually was.Manager Emma Tolmie, 27, said: "When he started singing it, everyone kind of turned around, thinking that whoever this was, he was really good."At first people were thinking he was a Ricky Wilson look-alike. It was funny to see everyone's faces when it finally dawned on them who he was, especially the women. He was loving it, and at one point jumped up on the bar to pour himself a pint."The singer is understood to have been visiting friends in Edinburgh, and the group went for a night out in the city last Friday, along with Wilson's girlfriend. After the live band karaoke finished, the singer and his friends hired a private karaoke booth to continue the party and Wilson was heard singing more Sinatra songs – as well as a Take That medley.Waitress Lucy Simpson, 20, served cocktails to Wilson and his friends during their three-hour stint in the private karaoke booth – but even she had no clue who he was when he first arrived. She said: "I had absolutely no idea who it was at first. "He was just sitting in a corner chatting away like any normal customer. "Then he got up on stage and sang with the band."It was Fly Me To The Moon by Frank Sinatra and I remember it sounded good, but I didn't know who he was until one of the bar staff told me."Luckily he went into the karaoke room that I was waiting on that night."We had a bit of banter and he was very friendly and really down to earth."I went in a couple of times and caught him singing Take That, which was absolutely fantastic, and there was lots of chucking the microphone about. He absolutely loved it and had a fantastic time."