Artists from or somehow connected to Slovakia. Popular music began to replace folk music in Slovakia beginning in the 1950s, when Slovakia was a part of Czechoslovakia; American jazz, R&B, and rock and roll were popular, alongside waltzes, polkas, and czardas, among other folk forms. By the end of the '50s, radios were common household items, though only state stations were legal. Slovak popular music began as a mix of bossa nova, cool jazz, and rock, with propagandistic lyrics. Dissenters listened to ORF (Austrian Radio), Radio Luxembourg, or Radio Free Europe, which played more rock.