Patsy did several songs which are so complex melodically that almost no one else attempted them – another is I Fall to Pieces. https://am-records.com/2019/05/15/patsy-cline-i-fall-to-pieces/
Crazy was written by Willie Nelson in 1961.
Here is his version.
It’s ok (and all credit to him for writing such a great number) but nothing like as good as Patsy’s, released the same year as her follow-up to I Fall to Pieces. It reached No 9 in the US charts.
Cline died in a plane crash on March 5, 1963. She was 30.