Definition: In this task, you're given an article and an answer. Your task is to generate the fill-in-the-blank question for this answer based on the given article. The blanks are always at the end of the question, and can be filled with more than one word or phrase.
Input: Article: Art is sometimes divided into two kinds, high art and popular art. High art attracts a much smaller population than popular art,but the number is large and growing. People who enjoy high art go to the opera and symphony concerts ; they read serious books and go to serious plays ; they keep up with art exhibitions. Popular art is mainly a kind of amusement. Some TV programs are meant to be watched today and forgotten tomorrow. Many popular songs are hits for a few weeks ; then they disappear. Other songs remain popular for such a long time that they become _ . The line between high and popular art is not always clear,however. Many people believe that rock music, for example, is a real art form. Many films are also taken seriously ,while others disappear as nothing more than amusement. 
 Answer: popular art is a kind of amusement

Many more people like popular art than high art because   _  .