Apparently, it's easier to get a record deal if there are two of you who look exactly alike. Even if your musical genre is singing Christmas carols to the accompaniment of antique music boxes. Of course, in the case of the Williams twins, it helps if you have really cute feathered back hair and your uncle happens to be Andy Williams.
In Nashville it is impossible to turn around without bumping into either a Hager or a Nelson twin (I don't think I have a Nelson album, but I sure wish) and I even know someone who dated either Jim or John Hager back in the Hee-Haw days.
Finally, notice the ubiquitous Parthenon in the background of the Boyer Twins' masterpiece, Seminole Soul.