在新手群里和吧友叨**，说到这个问题，我查了一下，由于是英文顺手翻译了一下，放在这里给大家做一个参考。
Alan Freed, a disc jockey in Cleveland, Ohio used the phrase, “The Rock and Roll Session” to describe the amalgamation of rhythm and blues and country music he played during his show. As his radio show gained popularity, so too did the phrase.
电台音乐节目主持人阿兰·富力德当年形容他在show中演奏的这种混合了节奏、布鲁斯和乡村音乐使用了这个短语，Rock n' Roll Session（摇滚一刻）。
与此同时，他的电台show获得了成功（流行），所以才有更多人使用这个短语。