Addendum: Possibly useful links to assist obtaining recordings for listening per Christopher's recommendation. Regardless the country you're clicking from, those links should redirect to or offer to take you to the relevant source in your own country. 

My thanks for those artist recommendations Christopher.

1. Art Tatum and of course, not to forget Art Tatum material obtainable through Hal Leonard 

2. Joe Pass,  and additionally, available through Hal Leonard