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1964 – 1969
Conservatory in Bratislava, accordion and guitar, winner of scholarships for the Graz jazz school (AT, 1969) and Berklee College of Music Boston (USA, 1973) – did not take up studies for personal reasons
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1969
member of the Tatra Revue Orchestra
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1972 – 1973
stay in New York, appearances in local jazz clubs with various jazzmen (Attila Zoller, Kenny Dorham, Babs Gonsales, Albert Heath, Sam Jones, Joe Newman etc.)
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1974
member of Bratislava rock band Gattch; jazz festival in Lublin
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1974 – 1975
series of successful performances in Poland
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1975
festivals: Jazz Jantar ‘75 (Gdansk, PL); jazz pianists meeting in Kalisz (PL); Czechoslovak amateur jazz festival in Kroměříž (winner of the “best soloist” title), cooperation: Jiří Stivín, Karel Velebný, Luboš Andršt, Emil Viklický, Svatopluk Košvanec etc.
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1977 – 1978
leader of the Jonáš – Brisuda – Döme Trio
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1979
member of Vlado Valovič’s VV Systém
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1980
Bratislava Music Festival (with Emil Viklický)
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1983
member of the band Esprit
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1985
Bratislava Music Festival (with L. A. Barrero Perao – percussion, Cuba)
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1986
member of Dušan Húščava’s Quintet
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1990 – 1993
cooperation: Matúš Jakabčic, Juraj Bartoš, Robert Balzar (CZ)
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1991
Ladislav Martoník prize for jazz performance
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1992 – 1993
duo with Giovanni Mirabassi (clarinet, IT)
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1994
duo with Jana Kocianová (vocals)
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1995
duo with Ján Hajnal (piano); Košice Spring Musical Festival
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1997
successful appearances in Prague (Antonín Gondolán, Roman Pokorný, Karel Růžička –David etc.)
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1995
member of the Matúš Jakabčic Tentet (Bratislava Jazz Days‘95; Bratislava Music Festival ’96; jazz festival in Přerov ’97; Bratislava’s Days of Europe ’98 etc.)
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1998
member of a jazz quartet (Gabo Jonáš, Matúš Jakabčic, Juraj Kalász, Cyril Zeleňák)
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1999
establishment of Gabo Jonáš Quartet, composing and arranging own themes for them
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since 2002
duo with Peter Cardarelli (tenor saxophone, USA)