From Ponder Anew, a blog on Patheos (via my friend Bill Campbell):
No, the melodies of our beloved hymns weren’t borrowed from drinking songs, bar tunes, and tavern music. I’ve had about ten comments on my blog posts this week alone trying to use the bar song myth as their smoking gun in the case for commercial worship. It’s an argument many love to make, but it didn’t happen.
Those most often implicated in this myth are Martin Luther and the Wesleys. Luther did use German Bar form, a musical style in an AAB pattern having nothing to do with the suds. There is no indication John John and Charlie ever suggested such a thing, and knowing their position on imbibing and the importance placed on proper text/tune pairing, it’s unlikely the would have even considered the idea. Tunes were occasionally borrowed from existing folk songs, but they weren’t simply extracted from whatever people were singing at the local watering hole and paired with jesusy poetry. And even if they were, it was not, as commercial worship apologists are wont to say, in an effort to borrow from culture for the purpose of evangelism or getting butts on the stools…er…in the pews.
This rumor has been thoroughly debunked by both scholars and laypeople. So why do people still believe it? I’m not entirely sure, but it seems like the “Grassy Knoll” theory of Christian hymnody. There’s no evidence for it, but dang it, it’s just more interesting than the truth.
Irresponsible? Yes, absolutely.
Difficult to suppress? You bet.
Some Twitter exchanges promoting the idea follow.