From VGMdb:

Taku Iwasaki is a classically trained composer, arranger and performer for Anime & Games. Famous for his works Rurouni Kenshin, Tengen Toppa Gurren Lagann, Jojo Battle Tendency, Katanagatari and BUNGO STRAY DOGS. He is a composer that merges elements of musical impressionism, Golden Age Film music and Italian opera with Japanese folk and cinema and contemporary electronic musical styles, inspired by Hans Zimmer. He often collaborates with Hiphop artist Lotus Juice, singer Caoli Cano and soprano Yuri Kasahara for his anime works. In 2006 he recorded music with the Warsaw Philharmonic National Orchestra of Poland for GIN-IRO NO KAMI NO AGITO.