Is there a way to just play the audio from videos you have on your iPod Touch?

I have several live music videos on my Touch, and sometimes I just want to hear the music from them and not watch the videos. Is there a way to do this? I haven't figured it out yet; every time I try to turn the Touch screen off when I'm watching a video, the video AND audio shut off.

Thanks ahead of time for your help!

Havnt got my iTouch on me ATM .... Yes i know *sacrilege* lol, but does music still play when you switch it off using the TOP button. This works on mine, but havnt tried or needed to just listen to Audio from a music clip ....

Cheers