We know this arrangement was one of Tatum's 'party pieces', specialties that any solo performer must have. He recorded it many times. But in Tatum there is always improvisation in the sense that he is making everything sound fresh, and the differences and moods between versions become more apparent, the more you get to know him. Listen to the way he plays along the with the house band, playing their "we're back on" cue after commercials; making his own segue into his classic version of "Yesterdays". There is the whole history of jazz piano here, looking both forward and backward at the same time, but always so hip. The word 'stride' even seems inadequate. Hear the Monk-like seconds clusters? He was a big influence on the beboppers; that story about Bird getting a job as a dishwasher so he could listen to Tatum play every night. He wanted to be able to play his alto like Tatum's right hand.
This was recorded on Spike Jones' TV show in 1954 (he would pass away only months later, in 1956).
Just now in writing this post, checking the link from my YT channel to this post and listening to the track again, I thought it sounded 'too' fast, even for Tatum. Mechanically, unnaturally fast. Sure enough, after checking, it's sounding in Eb minor, instead of D minor. The pitch is wrong; we can see that he's definitely playing in Dm. And I'm sure all pianos were A=440 by the mid-50s.
I don't know why I didn't pick it straight away...but there ain't no perfect pitch in my 'shed. And no one said a word in the comments on YT. Where are all the perfect pitch people? 32,500 views so far, and not one soul picked it up.
I've now checked my original video file, then got out the DVD and checked that; both Ebm. Then I looked at other Tatum clips or docos on YT—all are Ebm. What's going on? Can everything on the internet and media be sourced from that one clip? (it comes from "Tatum Art" box set, Storyville Records 1088603, 2008). Maybe that's a sign of just how narrow our 'net' really is. Anyway, I'll be working towards getting a true key of Dm version out soon, somehow, once I figure out how to detune a video down a semitone.
This the original Jerome Kern:
Notice the movement is from Cm in the first bar, to Fm6 in the second - not the more modern interpretation Dm7b5 | G7b9. This is because there is no implied G7, no B natural in that second bar. That is a clue that Kern was after a modal effect, a pivoting or rocking from the tonic Cm (C-Eb-G) to the Fm6/Ddim (D-F-Ab), a I-II swaying. The only difference between the Fm6 and Dm7b5 is what bass note you have: if an F in the bass, it's an Fm6; if a D, then a Dm7b5. Note the slight ambiguity here in Kern's bass figures, almost like the second bar is | Fm6-Dm7b5-Fm6-Dm7b5 |. This is also because the melody note is an F, so he doesn't keep that F in the bass.
Now let's check out Tatum's version compared to the original Kern harmonies for these first two bars. Because I think Tatum's choices had a lot to do with the natural resonances of the actual piano pitches, as well as finger/hand feeling, I'm transposing the Kern up a tone to Dm, so we can contrast with Tatum's take on the harmony:
Tatum could easily span the Ab-C tenth on the Ab6 (sounding more like an Abma7 with the melody note G) although here it looks like he could be playing the C with the right hand. But he could play all 12 major 10ths - bang, down straight. Wouldn't that be a nice ability to have? To be able to nail every major tenth with the left hand, without having to roll/fake them.
As for the G7b5 - well the Db is so low it's a kind of a toss up between G7b5 and Db7b5. Half and half, top 'n' bottom. I've seen this voicing in Johnny Richards charts, in "Monk's Mood", a very ''40s' early bop sound with the low b5 (Db) almost in competition with the root (G). Usually the b5 on a dominant 7th will be more like a #11, that is, an 11th away from the root tone or fundamental. Here it's right up against it. And the Db in this context is kinda sounding like the C# of A7, the leading tone to get back to Dm again.
Sure, Tatum played this arrangement over and over, refining it over the years. But isn't that what 'living' arranging really is - making something that's basically worked-out come alive and fresh, like the performer just thought of it?