I'd go with the first one Jason. It has a great balance, interesting patterns and shapes. Blue tones for the water would add a nice contrast I think.
That's without knowing what kind of music they produce tho, but I just think it has the most potential for a cover out of the ones shown.
Just in case, a black & white version would work with almost any type of music.
@waNEr: Our media design professor mentioned we shouldn't be too afraid of image noise, since it can be easily reduced in post. Most likely it won't even be that noticeable, depending on the final used image resolution/print size.
He ended up being right in my opinion, correct focus and exposure time have a higher value. My widest aperture is 3,5, so you can't expect flawless interior shots of individuals from me with my gear.
I've just been at another wedding this weekend. I'll probably post some new pictures during the next week.