( `` Cowboy Bebop '' ) , `` Yakusoku wa Iranai '' ( `` Escaflowne '' ) , `` Gravity '' ( `` Wolf 's Rain '' ) , `` Inner Universe '' ( ' ) and ' .
( `` Cowboy Bebop '' ) , `` Yakusoku wa Iranai '' ( `` Escaflowne '' ) , `` Gravity '' ( `` Wolf 's Rain '' ) , and `` Inner Universe '' ( '' '' ) .