Sprawdźcie czy jest to dobrze napisane (błędy, konstrukcje zdań itp.)
Dear Sir, I am writing with regard to your last visit to a rock concert. I wish to disagree with several of your comments as follows. To begin with, there were a lot of people, it was impossible to go. For good measure, the singer was late. When he started to sing, it turned out that it was another singer. It emerged that he sings better. No one felt disappointed by the change. The singer played in commercials. Furthermore, regarding the problem with the sound Quality, this was only a temporary problem and lasted no more than ten minutes. Technicians quickly repaired the fault and we were all able to enjoy the music again. Everyone was happy sound quality. To sum up, I believe the whole event was well organised and an overall success. They were all very happy. I hope that these concerts will be more. I hope, therefore, that you will print this letter together with an apology to the performers, fans and event organisers like myself, who are looking forward to a similar event in the near future. Yours faithfully,
ogólnie to chyba dobrze tylko jeszcze na górze adres tak jak tam piszą w angli, to your faithfully powinno być na dole i jeszcze podpis