If the briefing is correct we can not go wrong. If there is any technical mistake it is our responsibility to repair it for example a glitch or any unwanted sound in the recording, But one has to please understand that we need to pay the musicians and the studio expenses irrespective of the fact whether you like it after the recording or not... If you want a different piece you will have to again pay for it separately. The 50% amount which you have already paid will not be refundable. That is why we say that briefing is important.