Circa 2000 is not a specific musical artist but rather refers to the time period around the year 2000, during which various significant changes and developments took place in the music industry. This era saw the rise of pop-punk bands, the continued popularity of grunge and alternative rock, and the emergence of hip-hop as a dominant genre. Notable artists from this period include Britney Spears, Eminem, N'Sync, and Radiohead, among others. The advent of digital music and file-sharing also began to change how artists distributed their music and how listeners consumed it. If you meant a specific artist, please provide more details.