transform dir "^(Boo) (Hewerdine)$" "$2, $1" sort
transform dir "^(Florence Foster) (Jenkins)$" "$2, $1" sort
+transform dir "^(Florence Foster) (Jenkins), (Jenny) (Williams), (Thomas) (Burns)$" "$2, $1; $4, $3; $6, $5" sort
transform dir "^(Milla) (Jovovich)$" "$2, $1" sort
transform dir "^(Avril) (Lavigne)$" "$2, $1" sort