Now that my aging iMac is on its last legs, I'm in the market for a new Mac (I'm leaning new or refurbished mac pro) but a big worry for me is iTunes. Since 2001, I've built up a massive iTunes library of custom-made MP3s transferred from my vinyl and shellac collection (33, 45, and 78). In 12 years, I've put in more hours than I care to admit creating the files, tagging them, and attaching album art for every track. We're talking 55,000+ files here. For my purposes, iTunes 11 is totally unacceptable. I've tried it and hated it. iTunes 10 is manageable but it's missing some critical (to me) features present in iTunes 9. I realize that any Mac I purchase new now will ship with Mountain Lion and iTunes 11. With a new Mac, could I trash iTunes 11 right out of the box and install iTunes 9 in ML? Is it even compatible? I realize that running such an old version of iTunes would make it impossible to sync with the latest iPods, iPhones, etc., but that's fine -- I don't use them anyway. I just want a solid desktop-based iTunes experience that enables me to easily organize and access my MP3s. It's important enough to me that I'd even consider stepping back a few generations hardware-wise to get a 2010 Mac Pro and Snow Leopard if that's what it takes to get iTunes 9 compatibility, but I'd much prefer to get a newer machine if it's do-able.