Following on from the release of Jaroslav Kořán’s “Zahrada” and Richter Band’s “Smetana”, Infinite Expanse returns once more to the early 90s Czech alternative music scene with another set of transcendental acoustic new-age recordings. It comes in the form of “Bohemian Blue”, an album by a short-lived trio formed by Jaroslav Kořán in 1990 following his departure from Richter Band and tracing his next musical steps. At the same time, Jaroslav Kořán, a fiddlerophone and percussion player, left the group and began to experiment with his own music. With him, he brought a range of musical experience from playing in the alternative rock group, Vyšší Populár, and the ambient outfit, Richter Band, as well as building and playing hand-made instruments. The fidlerophone, a unique instrument assembled using aluminium pots and mounted on sprung stands, formed the characteristic sound of Richter Band when played in unison with the subtle sounds of Pavel Richter’s electric guitar,and would later inspire Jaroslav to experiment in creating his own instruments.

Although he already owned a sampler and played the piano, as a drummer, he was constantly seeking new percussive instruments and sounds, ranging from water glasses and pots to porcelain plates and salad bowls. In the summer of 1990, he experimented with nails hammered into wood in Šumava, a national park in the South Bohemian regions of the Czech Republic, and the first "Šumava (or village) kalimbas" were created. Together with his brother Michal, they refined the kalimbas, trying out repetitive melodies on them, which they would then record at home and supplement with loops from a sampler and slowed-down tapes.

The newly recorded material, full of rhythms, pre-recorded loops and Michal Kořán's synthesizer, was presented for the first time in public in April 1990 at the Klarisky concert hall in Bratislava. Soon after, Jaroslav met Marek Hanzlík, a guitarist from another Prague-based band, Die Archa, leading to the formation of a new musical trio named Modrá (“Blue”). This led to a fundamental musical shift, with Marek’s prepared guitar bringing subtle harmonies and an unusual sound to the rhythmic structures, complemented by Jaroslav Kořán's slowed-down pre-recorded tapes, sampled loops and voices. Over November 1990 to June 1991, Modrá made a number of recordings in Jaroslav’s home studio. For “Bohemian Blue”, the most interesting pieces from this period were selected and supplemented with two compositions recorded live at a home concert in February 1991. Although the group was only short-lived, disbanding in the second half of 1991, it represents an important period of musical experimentation and marked the dawn of the nascent Orloj Snivců (“Horologe of Dreamers”), with whom Jaroslav Kořán still performs today.