Adult Contemporary (ədə́lt kəntɛ́mpərɛ̀ri) is a type of music that began in the 60s and 70s. This style of music relies heavily on the ballad and features tones that are melodic and smooth to the ears. This easy listening and soft rock sound has evolved from the 60s and 70s versions, but still features many of the same qualities. Emphasis is placed on the melody and the harmony so that listeners are interested in tuning in, yet are not offended by the lyrics or the sound. Often suitable as background music, this style of music is popular in the office environment and in businesses. From Barry Manilow, George Michael, to Celine Dion and Mariah Carey, the sound continues to be a popular one.