My condolences, that has to suck in such a big way with what was going for you. Here's hoping it's only a minor pothole on the road to success.

Unless your storage was physically destroyed I believe you can recover your lost data with the help of computer forensics.

Did you back it up in a hard drive? USB? A program?
That really does suck but your potential and talent isn't a complete reflection of your past music. You'll get past this, it might be hard work but you can do it