I will add: Anything Stephane Grappelli. A traditionalist might tell you to learn the head and chord changes to the 100 most recorded jazz standards as a core

I will add: Anything Stephane Grappelli. A traditionalist might tell you to learn the head and chord changes to the 100 most recorded jazz standards as a core basis for listening/learning. Along that line consider creating play lists that are all the same tune from different artists.