There is no need to complicate this or turn it into something other than what it is.
What are your favorite b-sides?
I thought about this while listening to a homemade Dion playlist, which included "Daddy Rollin'," the b-side of "Abraham, Martin & John." That track is an absolute killer! Another that came to mind was "Skyline Pigeon" by Elton. As an album track, "Skyline Pigeon" was a solo piano ballad found on "Empty Sky," but for the b-side of "Daniel," it was re-recorded with the classic Elton band and it suddenly felt like the Elton I had been listening to.
This also got me thinking about a week in 1982 when I tortured WNEW-FM DJ, Dan Neer.
Marshall Crenshaw's debut had been released and it was a favorite of the station. Of course, the single "Someday, Someway" was in heavy rotation, as well as a few others. I was working for my uncle at the time and business was non-existent. I sat at a desk with a radio and a phone that never rang. One morning I called into Dano's show and got him. I told him how much I loved the Crenshaw record and thought the best track was left off the album. He said, "Yes! Something's Gonna Happen is my fave, too! Gotta go." If you didn't know, "Something's Gonna Happen" was Marshall's first single for the indie label, Shake Records, also not on the debut.
He hung up before I could say that wasn't it. I was thinking of the b-side to "Someday, Someway," which was "You're My Favorite Waste Of Time." I called him the next morning, reminded him of yesterday's call, and requested my song. "I'll see what I could do." He played something from the album.
I called the next day. And the next. Finally, on Friday, last song of his set, he played "Favorite Waste Of Time" for my "new friend who will now kindly leave me alone."
That was fun, and years later when I was supplying CDs for Little Steven's Underground Garage, Dan Neer was my go-to guy, or more accurately, I was his. I told him the story. He did not remember, of course. I loved that Crenshaw b-side so much, my band at the time covered it and I sang it.
I guess I have no rules for this, other than trying not to choose something like "Rain" by The Beatles, or anything too obvious.