Yamaguchi's music career began on F-Label, where she released a trilogy of albums where she sang and played keyboards.
After the album Tsukihime (Japanese: 月姫; Moonlight Princess) in 1983, she changed her focus to providing music to others.
[1] Yamaguchi has composed songs for artists such as Yuki Saito[2] and Yukari Tamura.
[3] In addition, she has composed music for anime, including Ranma 1/2[4][5] and Pokonyan!.
After over 30 years, Yamaguchi began releasing new music herself, beginning with Tokisakashima (Japanese: トキサカシマ) in late 2018.