As suggested by others, there are a few options, however priority one, IMHO, is to have that music backed up on separate drive/s; CD's (a lot of here, if used), DVD's , usb drive/s and/or combinations of. Online storge is also an option, if available to you.
1) My son had just painfully edited about 25 gigs of music and photos, loaded them onto a usb drive less than a month old, only to have that drive die.
2) Based on his experience, loaded all my (100 plus gigs of) music, photos and important files onto muliple usb drives. Redundancy, yes, good move, yes, as my computer hard drive died shortly thereafter. I was back up and running in no time with just adding an new hard drive and reloading the programs.
All my data was stored safely in more than one place.
Redundancy makes life a little easier to cope with when computers don't!
A little off topic, however, important, IMHO.