Growing up I was profoundly shaped by the Contemporary Christian Music movement of the seventies. I, and many just like me, adopted Larry Norman's song Why Should the Devil Have All the Good Music? as our anthem. To justify our desire to infuse popular music into Lord's Day worship we appealed to Martin Luther's use of "bar tunes" as an important historical precedent. And this we did feigning respect for how the Church has worshipped the LORD in ages past.
I intend to write more on this. But for starters, consider this quote from Leonard Peyton:
"Many Christians who appropriate the goods of popular culture cite Luther as a precedent. A common claim is that Luther used tunes “from the bar.” However, musicological research since 1923 is weighing in heavily for Luther as the composer of his own melodies. Luther did use a musical form called a “bar” form. But this is a technical term referring to the architecture of music, not, as would normally be expected, a place where alcoholic beverages are consumed. Others mistakenly cite Luther’s famous question, “Why should the devil have all the good tunes?” When Luther spoke of the devil metaphorically, it was directed at the pope, not the pub. To rephrase what Luther was saying, “Why should we leave the great old hymns to the Roman Catholics?” It was an apology for the traditional, not the contemporary!"