Diederich Krug (25 May 1821 – 7 April 1880) was a German pianist and composer.
 He was born in Hamburg and studied under Jakob Schmitt.
 He wrote a large number of pieces for piano, around 350 in all, which were popular with amateur pianists.
 Typical examples are gathered in the "Pianoforte-Album" which appeared as No. 1220 in the "Collection Litolff"; it contains eight works: "Chant d'Adieu" (Op. 307), "Le petit Chevalier" (Op. 312 No. 2), "Einsames Haideblümchen" (Op. 329, No. 2), "La petite Coquette" (Op. 306), "Minnelied" (Op. 289), "Tyrolienne" (Op. 308, No. 1), "Der Wachtelruf" (Op. 317 No. 2), and "Impromptu-Romance" (Op. 286).
Karol Maciej Szymanowski (] ; 6 October 188229 March 1937) was a Polish composer and pianist, the most celebrated Polish composer of the early 20th century.
 He is considered a member of the late 19th-/early 20th-century modernist movement Young Poland and widely viewed as one of the greatest Polish composers.
Sebastian z Felsztyna (also Sebastian de Felstin, Sebastian Herburt) (c. 1480/1490?
 – after 1543) was a Polish composer and music theorist, regarded as the greatest Polish composer of the early 16th century.
Adam Sztaba (born 15 February 1975) is a Polish composer, music producer, conductor, arranger and pianist.
 He graduated in composition from Fryderyk Chopin Music Academy (now University of Music).
 He collaborated with many Polish and international stars such as: Caro Emerald, Quincy Jones, Sting, Chris Botti, Michael Bolton, José Carreras, Kenny G, Dolores O'Riordan, Ewa Malas-Godlewska, Jose Cura, Lemar, NDR Bigband, Ive Mendes, Lutricia McNeal, Dita von Teese, Helena Vondráčková, Karel Gott, Drupi, Edyta Gorniak, Maryla Rodowicz, Kayah, Ania Dabrowska, Sinfonia Varsovia, Polish Radio Symphony Orchestra.
 He made his debut at age 18 music for the musical "Mirage?"
.
 In 2003, together with Tomasz Filipczak, composed the music for the first Polish show dance "Opentaniec".
 In 2005 he founded the Adam Sztaba Orchestra.
 He was the musical director, arranger and conductor of many well-known television programs, including "Idol" (Polish edition), SOPOT FESTIVAL 2005 and 2006, "Dancing With the Stars" (Polish edition of "Strictly Come Dancing").
 In 2008 he was director of the Academy of the television program "Star Academy" (Polish edition).
 Recently he composed and recorded music for the film "From Full To Full".
 In September 2010 he was music director of the inauguration of the European Special Olympic Games 2010 in Warsaw.
 In December 2010 he performed with Sting and conducting the Polish Radio Symphony Orchestra in a concert to celebrate the 85th anniversary of Polish Radio.
 In July 2011 he was a music director of the concert on the occasion of the beginning of Poland's EU Presidency and performed with Chris Botti, Dolores O'Riordan, Michael Bolton and Kenny G.
 He was a juror in the Polish edition of the TV show "Must Be The Music".
 In 2016 he was musical director and conductor of the World Youth Day 2016 in Krakow, the musical highlight of which was the concert titled "Credo in Misericordiam Dei" with almost 2 million pilgrims attending.
Polish Requiem (original Polish title: Polskie Requiem; German: "" ), also A Polish Requiem, is a large-scale requiem mass for soloists, mixed choir and orchestra by the Polish composer Krzysztof Penderecki.
 The Lacrimosa, dedicated to the trade union leader Lech Wałęsa, was written for the unveiling of a statue at the Gdańsk shipyards to commemorate those killed in the Polish anti-government riots in 1970.
 He expanded the work into a requiem, writing other parts to honour different patriotic events over the next four years.
 The "Polish Requiem" was first performed in Stuttgart on 28 September 1984.
 Penderecki revised and expanded the work in 1993, and expanded it again in 2005 with the additional movement, Ciaccona .
 It is called "Polish Requiem" because its parts are dedicated to heroes and victims of Polish history.
 One of the better-known works by Penderecki, the mass largely follows the liturgical Latin of the requiem format with the addition of "Święty Boże ", the Polish translation of the Trisagion.
Paweł Łukaszewski is a Polish composer of choral music.
 He has won seven prestigious Fryderyk Awards.
 According to David Wordsworth, Łukaszewski is the best-known Polish composer of his generation in and out of Poland "by far" (Wordsworth 2013, p. 50).
Alexandre Tansman (12 June 1897 – 15 November 1986) was a Polish composer and virtuoso pianist of Jewish origin.
 He spent his early years in his native Poland, but lived in France for most of his life, being granted French citizenship in 1938.
 His Polish identity influenced several orchestral and chamber works, such as "Rapsodie polonaise" and "Quatre Danses polonaises", and some guitar works, such as "Hommage à Lech Walesa" and "Hommage à Chopin".
 His music is often said to be primarily neoclassical, drawing on his Polish Jewish heritage as well as his French musical influences.
The Masques op. 34 is a work for piano written by Karol Szymanowski from 1915 to 1916.
Hagith, Op.
 25, is an opera in one act by the Polish composer and pianist Karol Szymanowski considered one of the greatest Polish composers of the 20th century.
 The opera premiered at the Grand Theatre, Warsaw in 1922, nine years after its creation.
 The libretto in German was written by the Viennese secessionist poet and Szymanowski's friend Felix Dörmann.
"A Maiden's Prayer" (original Polish title: "Modlitwa dziewicy " Op.
 4, French: "La prière d'une vierge ") is a composition of Polish composer Tekla Bądarzewska-Baranowska (1834–1861), which was published in 1856 in Warsaw, and then as a supplement to the "" in 1859.
 The piece is a medium difficulty short piano piece for intermediate pianists.
 Some have liked it for its charming and romantic melody; others have described it as "sentimental salon tosh."
 The pianist and academic Arthur Loesser described it as "this dowdy product of ineptitude."

Question: What Polish composer and pianist wrote op. 34?
Answer: Karol Szymanowski