Soft rock, a subgenre that mainly consists of ballads, was derived from folk rock in the late 1960s, using acoustic instruments and putting more emphasis on melody and harmonies. Major sentimental ballad artists of this decade included Barbra Streisand, Nana Mouskouri, Elton John, Engelbert Humperdinck, Carole King, Cat Stevens and James Taylor. By the early 1970s, softer ballad songs by the Carpenters, Anne Murray, John Denver and Barry Manilow began to be played more often on "Top 40" radio.[25]