Shostakovich on old time radio?

I was lying bed this morning listening to an episode of All Star Western Theater, which features the Riders of the Purple Sage and their brand of western music. All of a sudden in the background music I  thought I heard a familiar theme. I went to Youtube and listened to the first few measures of the 5th Symphony of Dmitri Shostakovich, and sure enough, that was it. Now, it might have been pure coincidence, but that theme is unique enough that it is unlikely. Possibly the composer who wrote the music for the show just wove a little highbrow into the background.