Question: What song, originally composed by Pyotr Ilyich Tchaikovsky, was performed by Elizabeth de la Porte in South Africa? 
Context: The String Sextet in D minor "Souvenir de Florence", Op. 70, is a string sextet scored for 2 violins, 2 violas, and 2 cellos composed in the summer of 1890 by Pyotr Ilyich Tchaikovsky.  Tchaikovsky dedicated the work to the St. Petersburg Chamber Music Society in response to his becoming an Honorary Member.  The work, in the traditional four-movement form, was titled "Souvenir de Florence" because the composer sketched one of the work's principal themes while visiting Florence, Italy, where he composed "The Queen of Spades".  The work was revised between December 1891 and January 1892, before being premiered in 1892. The Piano Concerto No. 1 in B-flat minor, Op.  23, was composed by Pyotr Ilyich Tchaikovsky between November 1874 and February 1875.  It was revised in the summer of 1879 and again in December 1888.  The first version received heavy criticism from Nikolai Rubinstein, Tchaikovsky's desired pianist.  Rubinstein later repudiated his previous accusations and became a fervent champion of the work.  It is one of the most popular of Tchaikovsky's compositions and among the best known of all piano concertos. The 1917 Petipa/Ivanov/Drigo revival of Swan Lake is a famous version of the ballet "Swan Lake", (ru. " Лебединое Озеро"), (fr.  "Le Lac des Cygnes").  This is a ballet by Pyotr Ilyich Tchaikovsky based on an ancient German legend, presented in either four acts, four scenes (primarily outside Russia and Eastern Europe), three acts, four scenes (primarily in Russia and Eastern Europe) or, more rarely, in two acts, four scenes.  Originally choreographed by Julius Reisinger to the music of Pyotr Ilyich Tchaikovsky (opus 20), it was first presented as "The Lake of the Swans" by the Ballet of the Moscow Imperial Bolshoi Theatre on 20 February/4 March 1877 (Julian/Gregorian calendar dates) in Moscow, Russia.  Although the ballet is presented in many different versions, most ballet companies today base their stagings both choreographically and musically on this revival by Marius Petipa and Lev Ivanov, staged for the Imperial Ballet, first presented on 15 January/27 January 1895, at the Imperial Mariinsky Theatre in St. Petersburg, Russia instead of the original version. La Porte Municipal Airport (IATA: LPO, ICAO: KPPO, FAA LID: PPO) is a city-owned public-use airport located three miles (5 km) south of the central business district of La Porte, a city in La Porte County, Indiana, United States. Elizabeth de la Porte was born at Johannesburg in South Africa on 15 September 1941, the daughter of William James Tomlinson and his wife, the singer Betsy de la Porte.  For her schooling she attended Kingsmead College in Johannesburg.  For her piano studies she went to Adolph Hallis, and for Bach and for theory to Stefan Zondagh.  She was in her mid-teens when she played the Tchaikovsky First Piano Concerto for a South African radio broadcast; however her strongest affinities always lay with J. S. Bach.  When she won the University of South Africa's Overseas Scholarship it was for her piano performance of Bach's C minor Partita. Boulevard de la Zone is a street in the 13th arrondissement of Paris named from the historical military zone.  It has been planted with trees for much of its length of 515m and has an average width of 8m.  It runs from the Avenue de la Porte d'Ivry to the Avenue de la Porte de Choisy.  It now forms part of the ring-road around Paris, the "boulevard périphérique" or le périf. Undina (sometimes "Undine" or "Ondine") (Russian: Ундина ) is an opera in 3 acts by Pyotr Ilyich Tchaikovsky.  The work was composed in 1869.  The libretto was written by Vladimir Sollogub, and is based on Vasily Zhukovsky's translation of Friedrich de la Motte Fouqué's "Ondine". In mid- to late-19th-century Russia, Pyotr Ilyich Tchaikovsky and a group of composers known as The Five had differing opinions as to whether should be composed following Western or native practices.  Tchaikovsky wanted to write professional compositions of such quality that they would stand up to Western scrutiny and thus transcend national barriers, yet remain distinctively Russian in melody, rhythm and other compositional characteristics.  The Five, made up of composers Mily Balakirev, Alexander Borodin, César Cui, Modest Mussorgsky, and Nikolai Rimsky-Korsakov, sought to produce a specifically Russian kind of art music, rather than one that imitated older European music or relied on European-style conservatory training.  While Tchaikovsky himself used folk songs in some of his works, for the most part he tried to follow Western practices of composition, especially in terms of tonality and tonal progression.  Also, unlike Tchaikovsky, none of The Five were academically trained in composition; in fact, their leader, Balakirev, considered academicism a threat to musical imagination.  Along with critic Vladimir Stasov, who supported The Five, Balakirev attacked relentlessly both the Saint Petersburg Conservatory, from which Tchaikovsky had graduated, and its founder Anton Rubinstein, orally and in print. Le baiser de la fée ("The Fairy's Kiss") is a ballet in one act and four scenes composed by Igor Stravinsky in 1928 and revised in 1950 for George Balanchine and the New York City Ballet.  Based on Hans Christian Andersen's short story "Isjomfruen" (English: The Ice-Maiden), the work is an homage to Pyotr Ilyich Tchaikovsky, for the 35th anniversary of the composer's death.  Stravinsky elaborated several melodies from early piano pieces and songs by Tchaikovsky in his score.  A commission by Ida Rubinstein from 1927, the ballet was choreographed by Bronislava Nijinska and premiered in Paris on 27 November 1928. The Mont d'Ambin base tunnel (also known as the Mont Cenis base tunnel) is the largest engineering work of the Lyon–Turin rail link project.  Reconnaissance work began on the French side in 2002 with the excavation of access points at Modane, then Saint Martin la Porte (2003) and La Praz (2005), and on the Italian side in 2011 at La Maddalena.  Construction has yet to start officially, but the 9 km reconnaissance gallery that is being tunneled from Saint Martin de la Porte towards Italy is bored along the axis of the South tube of the tunnel and at its final diameter.
Answer: Piano Concerto No. 1