After leaving the flute-centered Ihre Kinder in 1972, guitarist Muck Groh formed the jazz-rock Aera. Similar in sound to mid-period Embryo, Ihre Kinder relied heavily on flutes and saxophones. The band's first album, the all-instrumental Humanum Est, was entirely written by the guitarist. However, by the time of their second album Hand Und Fuss (1976), the musical leadership of the band had switched to wheelchair-bound saxophonist and flautist Klaus Kreuzeder, who included vocals on some of his songs. Although the group disbanded not long after their sophomore effort, Kreuzeder reformed the group in 1978 and released four albums before ending the group for good in 1982.