There are different schools suited for different needs. Some of these schools require no musical knowledge, while some of them require you to be musically proficient and usually require some sort of performance.
There are schools such as Full Sail University in Florida, Five Towns College on Long Island, and Dubspot in NYC, LA, and online. These schools won't require any musical knowledge.
Prestigious schools such as Berklee in California, and the Clive Davis Institute in NYC require a performance, but these are the most promising types of schools if you're passionate about music
If you're serious about music, and want to be accreddited for it in a form of a degree, then I would recommend either your local community college or the Dubspot courses in NYC. These are (relatively) cheaper courses compared to four year degrees and universities. If you were to go for Dubspot I would go for one course instead of the master class just to dip your feet in the water. If you prove to be talented and passionate in this field, and wish to continue on with a traditional musical education, then you can consider a prestigious university. Remember these are very expensive, and wont guarantee a career. In essence, anything you learn in these schools, you can learn by yourself on your own time at a fraction of the price.
Good luck.