The melody of Crazy Train by Ozzy Osbourne runs 217 notes across 37 bars, 3:09 long in A at 140 beats per minute. The tab sits moving up the neck in places, one note at a time — no chords to barre and no strumming pattern to keep up with. A piano backing track plays the chords and bass underneath, so the line you are learning sounds like the record even at half speed.
Prefer to strum and sing it instead? Crazy Train chords and lyrics.