Maria Wiesner studied at the Conservatory in Bratislava (1970-1976). From 1976 to 1989, she worked as a teacher in the town of Partizánske and a year in the town of Topoľčany. As teachers in music schools, they were under the surveillance of the school director and the city police because their recordings were circulated among the people. Maria Wiesner said: “Once we were called to the staffroom by the director where the district inspector of education, the head of education, the director of the police and the director of the school were waiting for us. They played our own recording on the tape recorder and they wanted us to tell them the names of all the participants. We didn’t give the names of anyone except ourselves. Then we were interrogated “why we believed such delusions” and we were threatened by being dismissed. A few days later, I was called to the director where he gave me an already written application for the termination of my employment. I didn’t agree. The next day, he gave me a letter, transferring me to another school, to Topoľčany, for ideological and political reasons. In the next school year, I commuted 20 km daily to my workplace. Besides me, another colleague of mine was transferred for the same reasons to the music school in Chynorany. Their aim was to “break up” the band so that we could not be in touch. The National Security used to follow me, at times a police car used to accompany me on my way home from work, or to our meetings up to the house of my friends. It was a very unpleasant mental pressure.”The leader of Radostné srdce, Maria Wiesner, as well as the other members of the band, used to distribute their illegal cassettes and songs during their performances in various Christian communities and religious denominations from 1980 to 1989. Their subsequent albums, Čakám v nádeji [I’m Waiting in Hope] and Vianočné koledy [Christmas Carols] (1990) were recorded in Miloš Sládečka’s private studio in the town of Partizánske, and their  Malý Dávid 2 [Little David 2] album in the P.S. Publisher 2002 studio. Since 1989, they have continued to perform in Partizánske, they play in public concerts, most often in Partizánske but abroad as well – in Switzerland, Germany, and Austria.