Code:
alias demo {
  var %f = "C:\Path\To\Song\Song_-_title.mp3" Blah
  /echo -s 
  /echo -s Parsed: $songFromFile(%f)
  /echo -s Dir: $songFromFile(%f).Dir
  /echo -s File: $songFromFile(%f).File
  /echo -s Artist: $songFromFile(%f).Artist
  /echo -s Song: $songFromFile(%f).Song
  /echo -s 
}
alias songFromFile {
  if ($prop == dir) return $nofile($gettok($1-, 1, $asc(")))
  else if ($prop == file) return $nopath($gettok($1-, 1, $asc(")))
  else if ($prop == artist) return $gettok($nopath($gettok($1-, 1, $asc("))), 1, $asc(-))
  else if ($prop == song) return $gettok($gettok($nopath($gettok($1-, 1, $asc("))), 2, $asc(-)), 1, 46)
  else return $gettok($1-, 1, $asc("))
}

-KingTomato