By 1968, while at its peak of popularity, soul began to fragment into disparate subgenres. Artists such as James Brown and Sly and the Family Stone evolved into funk music, while other singers such as Marvin Gaye, Stevie Wonder, Curtis Mayfield and Al Green developed slicker, more sophisticated and in some cases more politically conscious varieties of the genre. However, soul music continued to evolve, informing most subsequent forms of R&B from the 1970s-onward, with pockets of musicians continuing to perform in traditional soul style.