While record shopping about four years ago, I did a double take as I flipped through the 45s. I thought, "Surely, that label doesn't say what I thought it said." Sure enough, as I flipped back to it, there it was--"Bach Minuet In G" by Willie Nelson. It's the flip side of Nelson's "Living In The Promiseland" and was such an unlikely find that I bought it. Nelson's take on it is impressive, especially as it becomes progressively faster.
Shortly after this, I went to a Chinese restaurant I'd visited many times. To my surprise, as I opened the door, the new doorbell went off--playing a substantial portion of Bach's "Minuet In G!" Within a week, the restaurant switched back to its previous two-tone doorbell. Although the simpler doorbell was probably less intrusive for the customers and staff, I was slightly disappointed.
You just never know where you'll find a surprisingly good cover.