You have lots of options and it really depends how you want to take things forward.
If you think the band may become popular you could make them sign you as their official photographer then anyone using shots of the band has to pay you a commission. You may think it was fun to do the one off shoot but I do not want to be involved in future events so you would ask for a single usage payment i.e they can use the shots on the poster (the magazine will have to negotiate it's own rate with you).
Whatever your final agreement is with the band make sure you get everything in writing so that both sides are happy with the arrangement and cannot change their mind in the future without further negotiation.
Nikkor AF-S DX; 18-105 f/3.5-5.6G VR, 55-300 f/4.5-5.6G VR, 35mm f/1.8G
Speedlight SB-700 http://keystrokesukimages.com