Article: Much of the music recorded by singer-songwriters such as Diana Ross, James Taylor, Carly Simon, Carole King and Janis Ian got as much, if not more, airplay on this format than on Top 40 stations. Easy Listening radio also began including songs by artists who had begun in other genres, such as rock and roll or R&B. In addition, several early disco songs, did well on the Adult Contemporary format.

Now answer this question: Along with rock and roll, what genre of music was sometimes featured on Easy Listening radio?
R&B