Most of the PC problems I read about are self inflicted. In the vast majority of cases, the computer has huge numbers of old files on the hard drive that are the result of programs being installed, then uninstalled. More often than not the files are shared by other programs, thus creating problem when uninstalled. I have a friend who has a Mac and experienced similar problems, and for the same reason--installing and uninstalling lots of programs.
While virus' are rare with Macs, they do occur, just not with the same frequency because the a**holes that create them can get the same bang for the buck as they can targeting PCs.
George named two music programs that are supported by Mac, and I'm sure there are a few others. However, nearly all are supported by PCs, and online help with any of them is readily available. Not sure this is the case with Mac.
Peter, I would think seriously about making the switch, especially if you use the computer to run a business and perform multiple tasks. Mac is well known for being a stable platform, particularly for graphics applications, but for diversity I don't believe it can compare to the PC.
Good Luck on your decission,
Gary
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Travlin' Easy