00s R&B and hip-hop continued to dominate popular music as the 2000s began. Underground musical scenes exploded with the emergence of free, easy music distribution - these styles were characterized in part by musical retromania, and the reappropriation of styles from the 60s, 70s and 80s. Electro and indie rock began to have more of an impact on the mainstream in the late 2000s. Scene, or 'Emo' culture emerged in the mid-2000s, turning the pop punk of the 1990s into post-hardcore. Hipster culture gave birth to genres such as Electroclash, and later a renaissance in Psychedelic and Folk Rock. Portable music devices and online downloads changed the way music was consumed, with people often opting to purchase singles instead of full albums. There has been some debate over the naming of the decade, which has been referred to as the zeros, the oh-ohs, the 2000s the aughts, and the naughties.