• 1948 – 1955

    Construction Faculty of the Slovak Technical University in Bratislava, self-taught musician

  • 1940s

    member of amateur groups, playing jazz and popular music

  • 1947 – 1949

    member of the Bratislava University Graduate Orchestra

  • 1953

    two months with the Gustav Brom Orchestra

  • 1953 – 1958

    played with the Ján Siváček Orchestra

  • 1954

    the founding of a combo made up of members of the Siváček Orchestra (Juraj Henter, Jozef Jelšovský – trumpet, Karol Ondreička – guitar, J. Štefanovič – piano, Z. Eliška – bass guitar, J. Bauer – drums), which was the first group in Slovakia to specialise in modern jazz (be bop, cool jazz)

  • 1959 – 1962

    member of the Jaroslav Laifer Orchestra

  • 1961 – 1963

    participated in Braňo Hronec’s Bratislava Studio, oriented towards the mainstream style

  • 1966 – 1967

    member of Karol Ondreička’s Combo 4, with which he made a number of radio sessions

  • 1970s

    an orientation towards popular music; returned to jazz in the 1980s

  • 1985

    performed in the Hudobné štúdio M television programme (dedicated to the former Bratislava Studio band)

  • 1986

    Prize for Best Solo Performance at the Slovak Jazz Festival in Žilina (as a soloist for the M Quintet); member of the Bratislava Big Band

  • 1992

    founded Evergreen-4, oriented towards swing (I. Ťažký – double bass, D. Henčiar – drums, Gabo Jonáš, Pavol Bodnár, Alois Bouda, Ján Hajnal – piano, Ria Hajnalová – vocals)

  • 1993 – 1995

    member of the Gustav Brom Orchestra (led by Vlado Valovič)

  • 1996

    member of the Military Artistic Ensemble’s Big Band in Bratislava

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