The popularity of ballads and R&B led to the development of a radio format called Urban adult contemporary. Popular American contemporary R&B artists included Mariah Carey, Mark Morrison, Faith Evans, 112, D'Angelo, Lauryn Hill, Whitney Houston, En Vogue, Toni Braxton, Boyz II Men, Mary J. Blige, Dru Hill, Vanessa Williams, Groove Theory, Bell Biv Devoe, Jodeci, Jon B., Diana King, Tony! Toni! Tone!, Tara Kemp, Brownstone, Shanice, Usher, SWV, Silk, 702, Aaliyah, Keith Sweat, TLC, Xscape, Brandy, Monica, Mýa, Total, Tevin Campbell & R.Kelly. In contrast to the works of Boyz II Men, Babyface and similar artists, other R&B artists from this same period began adding even more of a hip hop sound to their work. The synthesizer-heavy rhythm tracks of new jack swing was replaced by grittier East Coast hip hop-inspired backing tracks, resulting in a genre labelled "hip hop soul" by producer Sean Combs. The style became less popular by the end of the 1990s, but later experienced a resurgence.