RewriteCond %{HTTP_HOST} ^([a-z]+)?-music\.blackplanet\.com$ [NC]
 RewriteRule ^/([-_a-zA-Z0-9]+)/?$ http/%1.blackplanet.com/music/view/artist.html?page_url=$1 [R]
 RewriteRule ^/?$ http/%1.blackplanet.com/music/ [L,R]