The music to Mega Man Zero, the first game, was composed by Ippo Yamada with one track by Setsuo Yamamoto; the music of Mega Man Zero 2 was composed by Yamada, Masaki Suzuki, Luna Umegaki, Chicken Mob, and Tsutomu Kurihara; the soundtrack of Mega Man Zero 3 was composed by Yamada, Suzuki, Kurihara, and Umegaki; and Mega Man Zero 4's music was composed by Yamada, Suzuki, Umegaki, and Shinichi Itakura.

The tracks were composed by Ippo Yamada, Luna Umegaki, Chicken Mob, Masaki Suzuki, Tsutomu Kurihara, and Makoto Tomozawa, though "Theme of ZERO", taken from the soundtrack of Mega Man X, was composed by Setsuo Yamamoto.

The tracks were composed and remixed by Ippo Yamada, Luna Umegaki, Masaki Suzuki, Chicken Mob, and Tsutomu Kurihara.

The tracks were composed and remixed by Ippo Yamada, Luna Umegaki, Masaki Suzuki, Makoto Tomozawa, and Tsutomu Kurihara.

The two-disc album was published by Inti Creates on December 12, 2004 with the catalog numbers INTIR-004/5.

The tracks were composed and remixed by Ippo Yamada, Luna Umegaki, Masaki Suzuki, Shinichi Itakura, and Chicken Mob.

The two-disc album was published by Inti Creates on September 30, 2005 with the catalog numbers INTIR-006/7.

The tracks were composed and remixed by Ippo Yamada, Luna Umegaki, and Tsutomu Kurihara.