Jim Čert, by his own name František Horáček, is a Czech singer and accordionist who sings his own ballads based on East Slavic folklore with frequent quotations of Baroque music and on texts by prominent writers such as Eduard Štorch, Bohuslav Reynek, Andrej Stankovič, Luděk Marks, and J. R. R. Tolkien, translated by Stanislava Pošustová.

In the repertoire, he sometimes adds to the repertoire such old-fashioned pub ditties as Ručičky, nebojte se, or even parodies such as Mistr z Transporty to the theme tune of the film Přednosta stanice, Why don’t we have booze quoting the TV musical Cinderella, Marijuana by D. Peel, or a cover of The Hever And Vazelína Band’s Tesilová verbež.

After the fall of the Iron Curtain, he began to perform regularly abroad, touring France, Germany, Switzerland, Austria, Italy and Slovenia, before moving to San Francisco in 1991. He played at the San Francisco Int. Street Festival, Making Waves, Burning Man, Cotati Accordion Festival, Henry Miller Library - Big Sur and many other festivals. With Erno Šedivý in California he founded the music ensemble Life After Life, with which he toured Europe, performing in Germany, the Netherlands, Belgium, France and the Czech Republic.

Nowadays he lives in Prague, performing occasional concerts and accompanying himself on the accordion.