D
RewriteRule ^(artist|album|loadtrack)/([a-z]+)/$ ror_proxy.php?controller=$1&action=$2
RewriteRule ^(artist|album|loadtrack)/([a-z]+)/([a-z0-9-\+]+)(/|\.html)?$ ror_proxy.php?controller=$1&action=$2&id=$3

RewriteRule ^$ ror_proxy.php