Abacus

Abacus is a band that has been active since the 1970s, with a significant presence in the German art-rock scene. Formed in 1971, they gained recognition at the Germersheim rock festival alongside notable acts like Pink Floyd and Santana. The band's early discography includes albums such as "Abacus" and "Just a Day's Journey Away," released on Polydor in 1971 and 1972, respectively. However, the recent releases you mentioned, such as "Highland Warrior" and "European Stories," suggest a continuation or revival of the band's activity, with "Highland Warrior" being a concept album about Robert I of Scotland.

The band's evolution over the years has seen various lineup changes and shifts in style, but their early work is well-known for blending art-rock elements with a distinctive sound. For more detailed information on the band's current status or recent lineup, additional research might be necessary.