Recently, a friend of mine asked if I could photograph his band to use as promotional material along with their newly-recorded album. They want to use the image(s) to send to record companies, put on their website/Facebook, etc. I realize that they're very low on funds and I'm not charging them provided they give me credit, however I am concerned that if they get picked up by a record company the images could be used without my permission, credit and/or compensation.
I realize this is all very speculative, but I just want to be on the safe side. Should/can I copyright the photos I take before handing them over to the band members? And how? Is there any paperwork I should take care of? What protection would this give me, and what else should I know?
PS: I live in the US.