From 1966, here's the original backing track of "Mrs. O'Leary's Cow," from the Beach Boys' Smile, a/k/a the Most Famous Lost Album in Rock (Nay, Music) History.
Incidentally, while in the land of the Ignoble Frog, I was reading Catch a Wave: The Rise, Fall & Redemption of the Beach Boys' Brian Wilson, by Peter Ames Carlin, which has all the amazing backstory on the above and much more, and is highly recommended.
As always, a coveted PowerPop No-Prize will be awarded to the first reader who gleans the track's relevance to the theme of tomorrow's Weekend Listomania.
And boy, am I not holding my breath on THIS one.
[h/t Kerrin L. Griffith]