" Lush Life", by Billy Strayhorn, is a very long and highly complex song. Sinatra failed in his attempt to record this as the soundtrack indicates. He just gave up and in the refrain, you can hear him straining and several notes were actually off pitch.
In contrast, listen to Queen Latifah perform it beautifully .You can see and hear how well Strayhorn, at age 21, mastered a striking melody and provided insightful lyrics describing the Lush Life.

https://youtu.be/O2-MalOvxD4 


https://youtu.be/mub-gyuPFlw