Question: Who is a Polish politician that was also famous for performing Piano Concerto No. 4 by Anton Rubinstein?

Context paragraphs:
Piano Concerto No. 2 (Rubinstein): The Piano Concerto No. 2 in F major, Op. 35, is a Romantic written by Anton Rubinstein in 1851, one year after his first.  Stylistically it is less clichéd than the first, yet still displays the full virtuoso nature of the piano.

Ignacy Jan Paderewski: Ignacy Jan Paderewski, GBE (] ; 18 November [O.S. 6 November] 1860  – 29 June 1941) was a Polish pianist and composer, politician and spokesman for Polish independence.  He was a favorite of concert audiences around the world.  His musical fame opened access to diplomacy and the media.

Piano Concerto No. 2 (Saint-Saëns): The Piano Concerto No. 2 in G minor, Op.  22 by Camille Saint-Saëns, was composed in 1868 and is probably Saint-Saëns' most popular piano concerto.  It was dedicated to Madame A. de Villers née de Haber.  At the première, the composer was the soloist and Anton Rubinstein conducted the orchestra.  Saint-Saëns wrote the concerto in three weeks, and had very little time to prepare for the première; consequently, the piece was not initially successful.  The capricious changes in style provoked Zygmunt Stojowski to quip that it "begins with Bach and ends with Offenbach."

Piano Concerto No. 1 (Rubinstein): The Piano Concerto No. 1 in E minor, Op. 25, written in 1850 and published in 1858 by Anton Rubinstein is a Romantic concerto is dedicated to Alexander Villoing, the composer's principal piano teacher.  It is his fourth attempt at writing a concerto, two were from 1849 and were lost while the third from the same year was transformed into a Piano Octet, Op. 9.  Although the First Concerto is the most traditional of the five concerti, a characteristic leonine quality in the piano scoring often emerges throughout.

Piano Concerto No. 2 (Tchaikovsky): Pyotr Ilyich Tchaikovsky's Piano Concerto No. 2 in G major, Op.  44, was written in 1879–1880.  It was dedicated to Nikolai Rubinstein, who had insisted he be allowed to perform it at the premiere as a way of making up for his harsh criticism of Tchaikovsky's First Piano Concerto.  Rubinstein was destined never to play it, however, as he died in March 1881.  The premiere performance took place in New York City, on 12 November 1881.  The soloist was Madeline Schiller, and Theodore Thomas conducted the New York Philharmonic orchestra.  The first Russian performance was in Moscow in May 1882, conducted by Anton Rubinstein with Tchaikovsky's pupil, Sergei Taneyev, at the piano.

List of compositions by Sergei Rachmaninoff: The compositions of Sergei Rachmaninoff (1873–1943) cover a variety of musical forms and genres.  Born in Russia, he studied at the Moscow Conservatory with Nikolai Zverev and Anton Arensky, and while there, composed some of his most famous works, including the first piano concerto (Op. 1) and the Prelude in C-sharp minor (Op. 3, No. 2).  Although spread over three different opuses, he did go on to complete an important set of 24 preludes in all the major and minor keys.  His Symphony No. 1 (Op. 13) was one of his first compositions as a "Free Artist" after graduation, and subsequently his first critical failure.  The derision he received sent him into depression.  After being sent through autosuggestive therapy, he composed his second piano concerto (Op. 18), which is still part of the major orchestra repertoire today.  In 1909, he made his first tour of the United States, and composed Piano Concerto No. 3 (Op. 30), notable for its difficult cadenza.  After this, due to migration from Russia in 1917 and his busy concert career, his output as a composer decreased, and during this period, he completed only six compositions.  His last work, "Symphonic Dances" (Op. 45), was completed in 1940.

Mariela Cingo: Mariela Cingo (born 14 February 1978 in Korçë, Albania) is an Albanian pianist currently residing in the United Kingdom.  She started to learn music from the age of 6, and gave her first concert at the age of 7.  By the time she was 12, she had played the Haydn Piano Concerto in D with the Korcë Philharmonic Orchestra.  At the age of 17 she moved to the UK to continue her studies under the tuition of Professor Raphael Terroni at the London College of Music.  There she won many prizes, including the Piano Concerto Prize for her performance of Rachmaninoff's Second Piano Concerto.  Her recent engagements have included performances of Rachmaninoff's Second Piano Concerto with the Sutton Symphony Orchestra and Schostakovich's Second Piano Concert with the Orchestra of the London College of Music.

Piano Concerto No. 2 (Mendelssohn): The Piano Concerto No. 2 in D minor, Op. 40, was written in 1837 by Felix Mendelssohn and premiered at the Birmingham Festival of 1837, an event that also saw the premier of Mendelssohn's St. Paul Oratorio.  He had already written a piano concerto in A minor with string accompaniment (1822), two concertos with two pianos (1823 – 4), and his first Piano Concerto.  The concerto is about 23 minutes in length, and is scored for strings, flute, clarinet, oboe, horn, trumpet, and timpani.

Piano Concerto No. 4 (Rubinstein): The Piano Concerto No. 4 in D minor, Op. 70, by Anton Rubinstein is a Romantic concerto that was once highly esteemed and was in the repertoire of the Russian and Polish piano virtuosos Sergei Rachmaninoff and Ignacy Jan Paderewski.

Yellow River Piano Concerto: The Yellow River Piano Concerto () is a piano concerto arranged by a collaboration between musicians including Yin Chengzong and Chu Wanghua, and based on the "Yellow River Cantata" by composer Xian Xinghai.  Since its politicised premiere in 1969 during the Cultural Revolution, the Concerto has become popular in China and amongst overseas Chinese nationalists.  It is noted for a difficult solo part.  This piano concerto and the Butterfly Lovers' Violin Concerto, which tells the story of the Butterfly Lovers, are two internationally known Chinese works that combine Western music methodology with Chinese source materials.

Supporting paragraphs: Piano Concerto No. 4 (Rubinstein) Ignacy Jan Paderewski
Answer: Ignacy Jan Paderewski