My sister accidentally erased all my music by resetting the laptop back to the company settings:(?

If it was saved on iCloud you can get it back from there or if you got the music with iTunes just log in with the Apple ID you used to get your music back other music inless saved somewere else i'm not sure how to get it back with out looking in your deltied files if they are there if not you still could find them if you go to a electronic reaper store or somthing like that.