Spirituál kvintet was a Czech folk band formed in 1960 by Jiří Tichota and others. The band's relevance in Czech culture can be compared to the popular folk band the Weavers in the US. They are widely considered one of the best and most important Czech folk bands.Their album Šlapej dál (1985) sold more than 130,000 copies.

Source: Wikipedia (https://en.wikipedia.org/wiki/Spiritu%C3%A1l_kvintet)