R&B originated from blues, jazz, and gospel music in the 1940s-1950s United States. Common elements include rhythmic beats combined with soulful vocals about relationships, heartbreak, and everyday life. Famous R&B artists like R. Kelly and Mariah Carey helped popularize the genre in the late 20th/early 21st century by redefining its sound and putting it back in the spotlight. Conventions include sexually suggestive portrayals of males and females in music videos to appeal to predominantly female audiences, as well as a focus on simple melodies, lyrics, and tempos for dancing or emotional ballads.