This is an incredibly tough question, given that jazz varies so much. KOB is obviously a classic, of course, as is Take Five. But my go-to morning coffee recording is Bill Evans Live at the Village Vanguard -- a masterpiece. I am also a vibraphone nut, so I love Gary Burton, MJQ, and Lionel Hampton. Wes Montgomery for guitar, and sax . . . Lester Young (especially his 50's recordings, which are maybe not his peak, but are very well-recorded), Ben Webster, Stan Getz, just too many to name here.
But for all you Jazz aficionados, if you haven't listened to The Sound of Jazz, which is a soundtrack for a TV show that is available on YouTube and is available as a Blu-Ray CD, you absolutely must. That is an all-star cast, including Billie Holiday and Lester Young. It is EPIC, both as just audio and to actually watch the show and see them play! The soundtrack is slightly different from the show, as it was recorded a day earlier, but both are stupendous!