well nor is being in a tribute band so i'm at a dead loss there!
in response to your comment, i would agree that the voice is 'put on' a little - our singer (called chris, coicidentally) is doing an impersonation of chris martin's vocals, so what you're hearing isn't exactly our singer's natural voice, but that's the point i guess. very few tribute artists have voices that naturally sound like the original artist, so the name of the game is how well you can impersonate.
also, regarding the rhythm, i'm inclined to disagree on that front. when we recorded our demos (speed of sound and in my place) we played to a metronome. this is something coldplay do themsleves, as alot of the music when played live is pre-recorded, such as the string/synth parts to speed of sound. when you play along to backing tracks you need a 'click' sound in order to keep in time with it. bearing this in mind, it's virtually impossible to go out of rhythm, and considering the level of attention and pedantry we put into everything we do it's quite unlikely anything has gone out of time. i expect what you've heard was intentional!
wanted to try and reply without starting an argument, hopefully i've achieved that! thanks for listening anyway.