His frequent opera engagemements abroad include the Metropolitan Opera in New York (Dr Kolenatý in Janáček’s The Makropulos Case), Berlin State Opera or Teatro dell’Opera in Roma. During his career he has built an extensive opera repertoire including Verdi’s Fiesco (Simon Boccanegra), Philip II (Don Carlo), Zaccharia (Nabucco) and Falstaff, Mefisto (Boito: Mefistofele, Gounod: Faust), Leporello (Mozart: Don Giovanni), or Gremin (Tchaikovsky: Eugene Onegin).

Peter Mikuláš gives regular concerts with the Czech and Slovak Philharmonic Orchestras, Orchestre de Paris, Wiener Philharmoniker, RTV Madrid and Monte-Carlo Philharmonic Orchestra. Among many festivals he has attended there are the International Music Festival Prague Spring, Salzburger Festspiele and BBC Proms Festival in London. He has given concerts in the Wiener Musikverein, Royal Albert Hall in London, Gewandhaus Leipzig or Accademia di Santa Cecilia Roma. He cooperates with a number of outstanding conductors, such as Gerd Albrecht, Vladimir Ashkenazy, Jiří Bělohlávek, Semyon Bychkov, Aldo Ceccato, Charles Dutoit, Carlo Maria Giulini, Theodor Guschlbauer, Libor Pešek, Simon Rattle or Helmuth Rilling. His extensive discography (more than fifty recordings) include Shostakovich’s Symphony No. 13, Verdi’s Simon Boccanegra, Mozart’s Così fan tutte, Verdi’s Requiem, Dvořák’s Requiem and Stabat Mater.