After listening to song #1 a bit more, perhaps bar 12 could be an A7 if you assume that the D note on beat 1 is just an embellishment (i.e. not part of the chord).
(Song #2 is harder to transcribe, so let’s skip that.)
But if we look at song #3 (“The Thrill Is Gone” by B. B. King), it seems quite clear that the root note B in bar 12 is part of the chord:
Surely it’s quite clear in this case that bar 12 is chord I? (Again, my transcription could have mistakes; if so, please let me know.)
Hey Barney
In the last Bar of a 12 Bar, the V chord is often (but not always) played on beat 2 or 3, not beat 1.
Listen again to Pride and Joy because there is an obvious climb up, often chromatic going up to the 5. It’s harder to hear in Tore Down, but it is still there.
Thrill is gone is interesting, I’ve always played a V in the last bar, but on the original recording it’s certainly not obvious - in fact, on a close listen, I think I’ll remove it from the list!
On Crosscut Saw the V is inferred by the lead lines playing the V root note at the end of the turn around but the rhythm section is staying there too.
In hindsight, honestly, I should have picked clearer examples - I suspect that list was done from memory (was a long time ago!) and likely some of the tunes changed in my mind 
Have changed the tracks for more hopefully obvious examples - apologies for any confusion and well picked up!! Shows you are listening!
Hi Justin,
Thanks for the clarification! I went to listen to your new song recommendations, and they sound mostly uncontroversial, except for:
Song #1 “Boom Boom Boom” by John Lee Hooker: I might be completely off, but this sounds like the slow change progression? Every chord seems to span 2 bars; the bass plays a riff on the first bar and is silent on the second. I can transcribe it if what I’m saying isn’t clear.
Song #2 “Kansas City” by Jimmy Witherspoon: I’ve also realised that some bands just play it differently. (Now that I’ve said it, it seems blindingly obvious, but it didn’t occur to me till now.) For example, the top result on youtube is
(If you happen to listen to this recording and believe that I’m wrong, i.e. it’s chord V in bar 12, please let me know.)
On the other hand,
Perhaps you could add links to specific recordings on the song page? I would guess that most of your students wouldn’t know what the chord progression should sound like, and would start to associate the wrong sound with what they thought the chord sequence was. These ones sound straightforward to me:
