i'm wondering about taking some shots in low light, during a musical performance in a cafe. it won't be completely dark, but it will be inside at night. i want to end up with some unique shots. i want some that are blurred but i don't want them to look like camera shake. is there a way to keep the person in focus, but sort of streak the lights behind them? or will it just end up blurring everything as i slow the shutter speed down? thanks.