RAID 0 = Striping = Fast but data is gone if any drive fails
RAID 1= Mirroring = Data is good so long at only 1 drive fails.
If you only need 120GB of storage and are not worried about speed Mirroring is the proper setup, infact if you are not worried too much about write times...which you probably are not since it's for your music collection it is probably the best solution (RAID 0+1 or RAID5 is probably overkill).
Windows NT, 2000, XP, 2003/.NET all support software mirroring, I have not seen any real problems with it...I have seen broken mirrors from time to time and have had to re-establish them. However I have never not been able to recover all data after a disk failure.
I still suggest a hardware/semi-hardware based solution.
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