For those who doubt about the quality of the houston concert her is a video of the song "we will rock" which I found on emule. The link where you can download it is:
It might close some times or you have to wait but it is worth waiting believe me.
I don't wish to spoil this for anyone, but the video is of the live version that opened the show - which is already available on Greatest Video Hits 1.
I downloaded it, thinking it may have been the slow version....