Listen to every Megaman song from the classic series (Megaman 1-9) through this playlist.
Indeed, all of Inti Creates' sound unit contributed to MM9, and the one MM veteran in the sound team (Ippo Yamada, helped out on some of the SFC-era games) contributed only two tracks, albeit really good ones (Tornado Man's stage theme and the staff roll).MM10 was the same team plus a different guest composer for the robot master themes, all people who'd worked on the classic games. And I don't like it as much, sadly.For the curious, a list of who composed which stage in MM10:Blade Man - Akari Kaida (MM & Bass, Battle Network, ZX Advent)Pump Man - Yuko Takehara (MM6, MM7, MMX)Commando Man - Minae 'Ojilan' Fujii (MM4)Chill Man - Shusaku Uchiyama (MM8)Sheep Man - Mari Yamaguchi (MM5)Strike Man - Makoto Tomozawa (MM7, MMX, MMGB, Legends 1 & 2)Nitro Man - Manami Matsumae (Mighty no.9)Solar Man - Yasuaki 'Bunbun' Fujita (MM3, MM4).
For the most part, 10 is better than 9. 9 has the old Mega Man problems of unbalanced weapons and overly gimmicky stages that sometimes cross a line, though it's still better about these things than most of the older games. Thing is, 10 exists, and does none of these things.10 also has a better soundtrack.
9 has some standout tracks, but just about everything in 10 just works by itself and works well as a cohesive but varied soundtrack. On top of this, 10 simply has more and longer tracks. Both of these things probably have to do with hiring more composers, but also composers that were on the same 'wavelength' of how to do an NES Mega Man soundtrack; many of the hires worked on the NES and even worked together at one point.I know 9 hit a lot of people at the right time; it hit me too.
But 10 is a strictly better product, like any sequel should be, and seeing it as inferior to 9 is doing it a great injustice.