In hip hop's earliest days, the music only existed in live form, and the music was spread via tapes of parties and shows. Hip hop mixtapes first appeared in the mid-1970s in New York City, featuring artists such as Kool Herc and Afrika Bambaataa. As more tapes became available, they began to be collected and traded by fans. In the late 70's into the early 80's DJs began recording mixtapes out of their homes, referring to them as House Tapes. DJs such as Harold G. (who later became known as Whiz Kid) and DJ Super V would create personalized House Tapes which would eventually circulate throughout New York City. In the mid-1980s, DJs, such as Brucie B, began recording their live music and selling their own mixtapes, which was soon followed by other DJs such as Kid Capri and Doo Wop. Ron G moved the mixtape forward in the early 1990s by blending R&B a cappellas with hip hop beats (known as "blends"). Blend tapes became increasingly popular by the mid-1990s, and fans increasingly looked for exclusive tracks and freestyles on the tapes. Also since the 1990s, it describes releases used to promote one or more new artists, or as a pre-release by more established artists to promote upcoming "official" albums. In the hip hop scene, mix tape is often displayed as a single term mixtape. It is now a word to generally describe full-length albums released for free, which is the modern form of mixtape that was made a popular following by 50 Cent and his group G-Unit in the early 2000s, sometimes containing all original music, other times composed of freestyles and remixes of popular tracks.