Question: The Estonian Philharmonic Chamber Choir performs works by which Estonian classical and religious composer?
Context: Arvo Pärt (] ; born 11 September 1935) is an Estonian composer of classical and religious music.  Since the late 1970s, Pärt has worked in a minimalist style that employs his self-invented compositional technique, tintinnabuli.  Pärt's music is in part inspired by Gregorian chant.  His most performed works include "Fratres" (1977), "Spiegel im Spiegel" (1978), and "Für Alina" (1976).  Pärt has been the most performed living composer in the world for five consecutive years. Artur Lemba (24 September 1885, Tallinn – 21 November 1963, Tallinn) was an Estonian composer and piano teacher, and one of the most important figures in Estonian classical music.  Artur and his older brother Theodor (1876-1962) were the first professional pianists in Estonia to give concerts abroad.  Artur's 1905 opera "Sabina" was the first opera composed by an Estonian.  His Symphony No. 1 in 1908 was the first symphony composed by an Estonian. Te Deum is a setting of the Latin Te Deum text, also known as the Ambrosian Hymn attributed to Saints Ambrose, Augustine, and Hilary, by Estonian-born composer Arvo Pärt, commissioned by the Westdeutscher Rundfunk in Cologne, Germany, in 1984.  Dedicated to the late Alfred Schlee of Universal Edition, the WDR Broadcast Choir premiered the Te Deum under the direction of conductor Dennis Russell Davies on January 19, 1985.  The Te Deum plays an important role in the services of many Christian denominations, including the Paraklesis (Moleben) of Thanksgiving in the Eastern Orthodox Church.  Because of the unusual instrumentation Pärt employs, his Te Deum is not suited for use within the Orthodox Church.  It was recorded on the ECM New Series label in 1993 by the Estonian Philharmonic Chamber Choir and Tallinn Chamber Orchestra under the direction of Tõnu Kaljuste.  The piece is approximately thirty minutes long. The Estonian Philharmonic Chamber Choir (EPCC) is a professional choir based in Estonia.  It was founded in 1981 by Tõnu Kaljuste, who was its conductor for twenty years.  In 2001, Paul Hillier followed Kaljuste's tenure, becoming the EPCC's principal conductor and artistic director until September 2008, when Daniel Reuss took over the task.  The repertoire of the EPCC ranges from Gregorian Chant to modern works, particularly those of the Estonian composers Arvo Pärt and Veljo Tormis.  The group has been nominated for numerous Grammy Awards, and has won the Grammy Award for Best Choral Performance twice: in 2007 with Arvo Pärt's "Da pacem" and in 2014 with Pärt's "Adam's Lament", the latter was shared with Tui Hirv & Rainer Vilu, Sinfonietta Riga & Tallinn Chamber Orchestra; Latvian Radio Choir & Vox Clamantis. Michael Ostrzyga is a German Composer and Conductor based in Cologne.  He is known for his choral music in particular, being commissioned by festivals like the Schleswig-Holstein Musik Festival and performers like The Chamber Choir of Asia, the Finnish YL Male Voice Choir (Ylioppilaskunnan Laulajat), the Vienna Chamber Choir, Latvian Youth Choir "Kamēr..." and Chamber Choir Consono, among others.  His works are performed by ensembles like the Raschèr Saxophone Quartet, New Dublin Voices, the Australian Chamber Choir, Rheinisches Klavierduo, Swedish choirs Kammarkören Pro Musica and Allmänna Sången Neues Rheinisches Kammerorchester, The Choral Project (California) and SFA A Cappella Choir (Texas). The Lithuanian Chamber Orchestra (LCO) is a chamber orchestra based in Vilnius, Lithuania.  It was established by Saulius Sondeckis in 1960, giving their first performance on April 30, 1960.  Along with the Lithuanian National Philharmonic and the Vilnius String Quartet, the LCO is a resident group of the National Philharmonic Hall, though the Lithuanian State Symphony, the Kaunas State Choir, and the LCO are housed in the Lithuanian National Opera and Ballet Theatre.  The orchestra generally performs works of Lithuanian composers, and premiered works by the likes of Alfred Schnittke, Arvo Pärt and Peters Vasks.  It is also said to have a "special affinity for the works of Bach and Mozart."  Until 2004, the LCO was part of the Lithuanian National Philharmonic Society, but in that year, it gained independent status.  Saulius Sondeckis served as Artistic Director and Chief Conductor from its inception in 1960 until 2004 and violinist Sergei Krylov was appointed in 2008.  Yehudi Menuhin has conducted its choral-orchestral works. Chamber Choir Head Ööd, Vend is an Estonian chamber choir.  The chief conductor of the choir is the Estonian composer Pärt Uusberg. Dr. William John Dehning (August 13, 1942 - June 23, 2017) was an American conductor, teacher, and author who spent almost his entire career in the collegiate realm.  He was known primarily for his work as conductor of the University of Southern California Thornton Chamber Choir and as author of the book, "Chorus Confidential: Decoding the Secrets of the Choral Art", published in 2003.  Under his leadership, the Thornton Chamber Choir won seven prizes in international European competitions, including Grand Prizes in Varna, Bulgaria and Tours, France.  After winning the choral competition with the USC Chamber Choir in Bulgaria, Dehning was awarded the Judges' Conducting Prize by a panel of ten judges in 1999.  During his tenure, the ensemble also appeared at American Choral Directors Association (ACDA) conventions six times, including nationals in 2001 and 2005.  They also completed a tour of East Asia in 2006, performing at the National Concert Hall in Taipei.  While at Northern Michigan University from 1970–1972, Dehning was the founder of the Marquette Choral Society, which is still active.  Later, he was from 1985-1995 the founder/conductor of the California Choral Company, a semi-professional chamber chorus that attained a reputation in Europe as well as in the United States.  As Chairman of the USC Department of Choral Music (now retired), Dehning was awarded the first annual Dean’s Faculty Award for Excellence in Teaching, and he was also the 2007 recipient of the Thornton School's Ramo Award.  Dehning was one of four founding members of the National Collegiate Choral Organization (NCCO), which held its first national conference in San Antonio in 2006. The Dresdner Philharmonie (unofficial English translation: Dresden Philharmonic) is a German symphony orchestra based in Dresden.  Its principal concert venue is the "Kulturpalast".  The orchestra also performs at the "Kreuzkirche", the Hochschule für Musik Dresden, and the Schloss Albrechtsberg.  It receives financial support from the city of Dresden.  The choral ensembles affiliated with the orchestra are the Dresden Philharmonic Choir and Dresden Philharmonic Chamber Choir. The Vancouver Chamber Choir is a Canadian choir performing in Vancouver, British Columbia.  It was founded in 1971 and has commissioned and premiered more than 170 new choral works in over four decades.  The choir performs at home and abroad and has received many honours and distinctions from around the world.  The choir has toured throughout North America as well as Asia and Europe.
Answer: Arvo Pärt