Electric guitar...

YY1 said
Crazy Train is "busy" and uses a significant stretch on the ring and pinky fingers.

Real easy to get rusty on that one if you don't play it often.

Same goes for the acoustic intro to Fade to Black. They are mechanically similar.
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Oh yeah that's another one I work on that I just remembered when you said fade to black. Not fade to Black but for whom the bells toll entry... Also the fast way say what you will riff.