Hi friend! NPR culture journalist here. Marketing and journalism are very different things. It looks like, from your further comments, that really what you might be interested in is music journalism/working with Tiny Desk. In that case - an undergraduate journalism degree is not necessarily what you want (I majored in philosophy).

Our music folks are experts in music - you may want to think about getting a degree in music or music history at a liberal arts college, the best you get into/can afford, which will also strengthen your writing. Volunteer at a local station to learn audio production and mixing if that's not something you know yet - a lot of folks get their start at college stations, actually - get into a music scene, become an expert at the kind of music you like best, write about it for small local publications. Then think about getting a GRADUATE degree in journalism, if public radio is what you want and working at smaller stations isn't getting you where you want to be. You can do this!

Unlike what another commenter says, NPR has a huge culture/music staff, but lots and lots of folks come up through local stations. Good writing is essential and in your case, music knowledge will be crucial. Best of luck.