
Given the following passage

"These Christmas music marathons typically start during the week before Thanksgiving Day and end after Christmas Day, or sometimes extending to New Year's Day. Afterwards, the stations usually resume their normal music fare. Several stations begin the holiday format much earlier, at the beginning of November. The roots of this tradition can be traced back to the beautiful music and easy listening stations of the 1960s and 1970s.",

answer the following question. Note that the answer is present within the text.

Question: __ is a popular music genre and radio format that was most popular during the 1950s to 1970s 

easy listening
