B-sides

I went into a starbucks and they were playing “Who’s Lovin’ You” by Smokey Robinson and the Miracles, which was my number one favorite record when I was a kid, and I said so to the girl at checkout and added that it was the B-side of “Shop Around” (the real hit at the time). She says “what’s a B-side” and I explain it was the other side of the 45rpm record, and she pauses for a long time and says “The other side? What other side?”