He completed his studies in Vienna and Warsaw, among other institutions at the Fryderyk Chopin University of Music, where he studied with Lech Puchnowski and earned both the Concert Diploma and the academic degree of Magister (mgr).

As a solo accordionist, Melichar performed with the Netherlands Radio Symphony Orchestra, the RSO Vienna, the Bruckner Orchestra Linz, the Vienna Philharmonic, Camerata Athens, Ensemble Wiener Collage (serving as chairman since 2003), the Austrian Ensemble for New Music, Ensemble Die Reihe, Ensemble Kreativ, the K&K Experimentalstudio, and the Austrian Chamber Symphony Orchestra. He appeared at festivals including Wien Modern, Hörgänge, Vogtland Music Days, Carinthian Summer, and Musica Nova Brasil.

Through his collaboration with contemporary composers such as Friedrich Cerha, Violeta Dinescu, Tera de Marez Oyens, Karmella Tsepkolenko, and Erich Urbanner, new works for accordion were created, including chamber music for accordion.

As a bandoneonist performing works by Astor Piazzolla, Kurt Weill, and others, he appeared with the RSO Vienna, the Vienna Philharmonic, the Munich Radio Orchestra, the Mozarteum Orchestra Salzburg, the Lower Austrian Tonkünstler Orchestra, RSO Ljubljana, and the Okoun Ensemble.

From 1980 to 2022, Melichar taught accordion at the Anton Bruckner Private University in Linz (formerly the Bruckner Conservatory). He was appointed Professor in 1989 and, following his habilitation in 2006, Associate University Professor. He also served as a lecturer at national and international courses and seminars, for example at the Amsterdam New Music Seminar, and as a juror at accordion competitions.

In addition, Melichar has been active as an author of scholarly articles and lectures, and has participated in radio and television recordings. In 2023, he was awarded the Golden Badge of Honour of the State of Upper Austria

born 1957 in Vienna, studied in Vienna and Warsaw (with Lech Puchnowski). Soloist concert career as an accordionist and bandoneon-player with the Netherlands Radio Symphony Orchestra, Radio Symphony Orchestra Vienna, Bruckner Orchestra Linz, The Vienna Philharmonic, Camerata Athens, Ensemble Wiener Collage (since 2003 chairman), Austrian Ensemble for New Music, Ensemble Die Reihe, Ensemble Kreativ, K & K-Experimental Studio, the Austrian Kammersymphoniker at various festivals, such as Wien Modern, Hörgänge, Vogtländische Music Festival, Carinthian Summer, Musica Nova Brasil in most countries in Europe and overseas. Through his collaboration with contemporary composers (including Cerha, Dinescu, Marez Oyens, Tsepkolenko, Urbanner) a variety of new works for accordion, accordion and chamber music came about, radio and CD productions.
Works as a bandoneon player (works by Piazzolla, Weill and others) with the RSO Orchester Vienna, Munich Radio Orchestra, Mozarteum Orchestra Salzburg, RSO Ljubljana, Okoun Ensemble , a.o.
Teaching as a professor of accordion at the Anton Bruckner University, former BrucknerConservatory in Linz (1980 - 2022) and in international courses and seminars.
In the programme solo and chamber music by Klaus Ager, Luciano Berio, Friedrich Cerha, Edison Denisov, Sofia Gubaidulina, Georg Friedrich Haas, Ernst Krenek, Karl Kohn, Wolfgang Liebhart, Magnus Lindberg, Tera de Marez Oyens, , Astor Piazzolla, Gerard Preson, Joaquin Rodrigo, Murray Schaefer , René Staar, Karmella Tsepkolenko, Erich Urbanner.

absolvierte seine Studien in Wien und Warschau, unter anderem an der Fryderyk Chopin Musikuniversität bei Lech Puchnowski, wo er das Konzertfachdiplom und den akademischen Grad Magister (mgr) erwarb.

Solistisch als Akkordeonist war Melichar tätig mit dem Niederländischen Radio-Symphonieorchester, RSO-Orchester Wien, Bruckner-Orchester Linz, Wiener Philharmoniker, Camerata Athen, Ensemble Wiener Collage (seit 2003 auch Obmann),^[ Österreichischen Ensemble für Neue Musik, Ensemble Die Reihe, Ensemble Kreativ, K&K-Experimentalstudio, den Österreichischen Kammersymphonikern. Er trat auf bei Festivals, so den Wien Modern, Hörgänge, Vogtländische Musiktage, Carinthischer Sommer, Musica Nova Brasil.

Durch seine Zusammenarbeit mit zeitgenössischen Komponisten wie Friedrich Cerha, Violeta Dinescu, Tera de Marez Oyens, Karmella Tsepkolenko, Erich Urbanner entstanden neue Werke für Akkordeon, darunter Akkordeon-Kammermusik.

Als Bandoneonist mit Werken von Astor Piazzolla, Kurt Weil und anderen spielte er mit dem RSO-Wien, den Wiener Philharmonikern, Münchener Rundfunkorchester, Mozarteum-Orchester Salzburg,Niederösterreichische Tonkünstler,  RSO-Ljubljana, Okoun-Ensemble.

Von 1980 bis 2022 war Melichar Lehrer für Akkordeon an der Anton Bruckner Privatuniversität in Linz, (vormals Bruckner Konservatorium). 1989 erfolgte die Ernennung zum Professor, 2006, nach erfolgter Habilitation, die zum außerordentlichen Universitätsprofessor. Als Dozent war er außerdem bei nationalen und internationalen Kursen und Seminaren, zum Beispiel beim Amsterdam New Music Seminar und als Juror bei Akkordeonwettbewerben tätig.

Weiters tritt Melichar als Verfasser von Fachartikeln und Vorträgen, Rundfunk- und Fernsehaufnahmen hervor. 2023 wurde er mit dem Goldenen Ehrenzeichen des Landes Oberösterreich ausgezeichnet.