Problem with audio when recording video

I video'd this this past weekend at a kids' rock concert and while the volume is pretty loud, you can hear that the vocals are very muffled. This did not sound nearly as muffled from our Sony point and shoot camera. Almost like the noise cancellation is trying to cancel out voices. I'm wondering if people who have problem with the video sound also have problems with the hiss during calls. I know I do.
http://www.youtube.com/watch?v=G5hZuU1_qfU