Also how many of those people were in music development, and how many were on the sprites development?
Staff list NOTE: Sousuke Tamada, Satoshi Oota, Rena Yoshikawa, and Tomomichi Oota are not mentioned in Red and Green. Takeo Nakamura is listed but not as part of Parametric Design.
Director Satoshi Tajiri Programming Referred to as Program (Japanese: プログラム) in the Japanese versions.
Takenori Oota Shigeki Morimoto Tetsuya Watanabe Junichi Masuda Sousuke Tamada Character Design Ken Sugimori Atsuko Nishida Music Junichi Masuda Sound Effects Junichi Masuda Game Design Satoshi Tajiri Monster Design Ken Sugimori Atsuko Nishida Motofumi Fuziwara Shigeki Morimoto Satoshi Oota Rena Yoshikawa Game Scenario Referred to as Scenario (Japanese: シナリオ) in the Japanese versions.
Satoshi Tajiri Ryohsuke Taniguchi Fumihiro Nonomura Hiroyuki Zinnai Parametric Design Called Parameter Creation (Japanese: パラメータせってい) in the Japanese versions.
Kohji Nisino Takeo Nakamura Map Design Satoshi Tajiri Kohji Nisino Kenji Matsusima Fumihiro Nonomura Ryohsuke Taniguchi Product Testing Called Debug Play (Japanese: デバッグプレイ) in the Japanese versions.
Akiyoshi Kakei Kazuki Tsuchiya Takeo Nakamura Masamitsu Yuda Special Thanks Tatsuya Hishida Yasuhiro Sakai Wataru Yamaguchi Kazuyuki Yamamoto Akihito Tomisawa Hiroshi Kawamoto Tomomichi Oota Producers Shigeru Miyamoto Takashi Kawaguchi Tsunekazu Ishihara Executive Producer Hiroshi Yamauchi
US Version Staff US Coordination Gail Tilden Naoko Kawakami Hiro Nakamura William Giese Sara Osborne Text Translation Nob Ogasawara Programmers Teruki Murakawa Kohta Fukui Special Thanks Satoru Iwata Takahiro Harada Product Testing PAAD Testing NCL Super Mario Club Producer Takehiro Izushi
European Version Staff European Coordination Claude M. Moyse Markus Pfitzner John D. Kraft Naoko Kawakami Yusuke Edasawa Hiro Uesugi Kamon Yoshimura French Text Julien Bardakoff Jean-Baptiste Fleury German Text Patrick Fabri Italian Text Elena Fogazzaro Leonardo Pieri Spanish Text Susa Alcami Antonio Greppi Programmers Teruki Murakawa Kohta Fukui Special Thanks Takahiro Harada Kimiko Nakamichi French Product Testing NOE Product Testing Kai Zeh MP. Hugo NOA Product Testing K. Hudson T. Buechele German & Italian Product Testing NOE Product Testing Kai Zeh F. Tappert NOA Product Testing K. Hudson T. Buechele Spanish Product Testing NOE Product Testing Kai Zeh Andy Fey NOA Product Testing K. Hudson T. Buechele Producer Takehiro Izushi
source Junichi Masuda was apparently the only person who worked on music. There are no specific "sprite" people in the credits, so I'm guessing that the sprites were made by either the programming people or the monster design people.