His music has been performed in various venues across Europe, America, and Asia, and has been featured at international festivals such as Inventionen in Berlin, New Work in Calgary, Early Music Festival in Boston, LakeComo Festival, Nuovi Spazi Musicali in Rome, Young Euro Classic in Berlin, Hörgänge at the Konzerthaus in Vienna, Bolzano Festival 2016, Ostrava Days, Sagra Musicale Malatestiana in Rimini, Kauniainen Music Festival and Hauho Music Festival in Finland, Audio Art Festival in Cracow, Contrasts in Lviv, Kotor Art Festival, Sound City Days, Melos-Ethos Festival, and the Bratislava Music Festival.
Machajdík has collaborated and worked with some of the world's leading orchestras and ensembles such as the Janáček Philharmonic Orchestra, I.J.Paderewski State Philharmonic Orchestra, Berg Orchestra, Slovak Chamber Orchestra, Slovak Radio Symphony Orchestra, Camerata Europea, Luhansk Symphony Orchestra, Cluster Ensemble, Ensemble Metamorphosis, Virtuosi Lviv Chamber Orchestra, Prague Modern, Quasars Ensemble, Agon Orchestra, Mucha Quartet, Arte Quartett, and soloists such as harpists Floraleda Sacchi and Klára Bábel, clarinetists Martin Adámek and Guido Arbonelli, organists Carson Cooman, Olena Matselyukh and David di Fiore, cellists John Alex Heley, Piero Salvatori, Darry Dolezal and Jozef Lupták, harpsichordists Elina Mustonen and Asako Hirabayashi, violist Sasha Mirković, and accordionists Boris Lenko and Peter Katina, to name just a few. He has also composed scores for feature films and documentaries, contemporary dance, theatre and radio plays.
Once one of the central figures in the avant-garde and contemporary music scene in former Czechoslovakia for over 25 years, Machajdík has been awarded a 1988 Luigi Russolo Composition Prize, a 2011 International Visegrad Fund individual artist grant, and the Ján Levoslav Bella Composition Prize for his string quartets. He has also been the recipient of a 2016 grant from the Slovak Arts Council.
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