In the early years of the Easy Listening chart, the top song on the chart was generally always a Top 10 pop hit as well. The method for compiling the chart at that time allowed some rock and roll artists, such as Lesley Gore and The Drifters, to make the chart on occasion with their softer or ballad releases, regardless of whether Easy Listening and middle of the road radio stations were actually playing those songs. In 1965, no No. 1 pop hits appeared on the Easy Listening chart. After 1965, differences between the Hot 100 chart and the Easy Listening chart became more pronounced. Better reflecting what middle of the road stations were actually playing, the composition of the chart changed dramatically. As rock music continued to harden, there was much less crossover between the Hot 100 and Easy Listening chart than there had been in the early half of the 1960s.