At the age of 15, during an Academie de Musique Prince Rainier III competition, he was discovered by the conductor Lawrence Foster who obtained a scholarship from Princess Grace Foundation allowing him to work for three consecutive summers at Aspen Music Festival and School with Gabriel Chodos.

Beginning in 2002 he worked for four years with Bruno Leonardo Gelber and Germaine Deveze who asked him not to give any concert or participate in any competition during his apprenticeship.

Nicolas Horvath also plays little-known works such as Franz Liszt's Christus, Claude Debussy's The Fall of the House of Usher, the complete version of Erik Satie's The Son of the Stars as well as forgotten, neglected composers such as Moondog, Hélène de Montgeroult, Ludovic Lamothe, Jacques Champion de Chambonnières, Friedrich Kalkbrenner, Élisabeth Jacquet de La Guerre, Nobuo Uematsu, Charles-Valentin Alkan, Karl August Hermann... Nicolas Horvath stands out by organizing marathon concerts such as Erik Satie's Vexations which he performed 12 times alone and without any stop or break, the Nights of Minimalist Piano[1] and the complete Erik Satie or Philip Glass piano music.

[3] From the June 23 to July 27, 2013, he was invited by the DO NOT OPEN Gallery in Brussels to give his first exhibit, highly influenced by Clyfford Still & Hermann Nitsch[4] On April 11, 2014, in the Palais de Tokyo, he premiered the GlassWorlds, a gigantic Philip Glass Homage where 120 composers from 56 countries and all musical genres wrote a work for this program.

On October 31, 2015, The Gallery of Estonia (the Estonian pavilion) as part of the Milan World Expo closing day invited him to give the first Jaan Rääts music only recital.

[13] On April 28, 2019, he was the first pianist ever to perform in a single concert and without any break all 15 Karlheinz Stockhausen's Klavierstuke for solo piano in Nantes for the Variations Festival.