Music for the sprite-based throwback patterned after Mega Man 2 is by Ippo Yamada, Ryo Kawakami, Yu Shimoda, and Hiroki Isogai.
Mega Man 9 is included in the Mega Man Legacy Collection 2 compilation for Nintendo Switch, PlayStation 4, Xbox One, and Steam.
From the product page:
Mega Man Legacy Collection 2 is bursting with additional content, including time trials, remix challenges, a music player, and an extensive gallery of rare illustrations. Also included are the additional modes originally released as DLC for Mega Man 9 and 10, featuring extra stages and playable characters.Nintendo - Mega Man Legacy Collection 2
14 years ago, Mega Man 9 debuted in North America, throwing us back to the days of retro gaming with an 8-bit aesthetic and classic gameplay. pic.twitter.com/M5EySk3yPx
— Mega Man (@MegaMan) September 22, 2022