Must have classic recordings

Furtwangler's 1942 Beethoven 9th, Berlin - the Hitler's birthday bash. Not because it's a great recording - far from it, it's pretty bad. It is, however, like being in the path of an oncoming runaway train and you are staring at it hurtling towards you and rooted to the spot, unable to move. Yes, you asked for good recordings but the title was "must have" :)

Very good point Musicnoise. I only truly appreciated the Ninth, even though it was my "first love" of classical music, once I had got several copies. I now have 11 different versions but that's nothing - I have come across people who have over 50!
It is important, for me at least, to hear interpretations from the artists / conductors that I admire the most. (The reason I stay within known confines is that there are a standard group of the latter whom I know I can trust with just about anything. I can explore other interpretors at a later time if necessary). Only when you hear a few versions can you really get some understanding of what a piece can do for you. And only then can you know what to look for when seeking out the "ultimate recording" - if there is such a thing. Let's for the sake of this argument assume there is :)