Replying to Begineer needs DSLR

I am looking for a DSLR. I am new to photography, but am taking a course on it next year at school. I am interested in live music photography (shooting at venues, concerts, etc). I'm unbaised brand-wise, but it needs to be able to have interchangeable lenses, pretty sure most cameras can do that regardless though lol. Budget is low, but am willing to save. I have looked into Nikon 3100 and, barely, the Nikon 5100.

If repost, let die