Question: Who is the president of the senate in the country where Harrysong is from?

full_context: Document 1: Rag'n'Bone Man: Rory Charles Graham (born 29 January 1985), better known as Rag'n'Bone Man, is an English singer - songwriter. His first hit single ``Human ''was released in 2016 and his debut album, also named Human, was released in February 2017. At the 2017 Brit Awards he was named British Breakthrough Act and also received the Critics' Choice Award.
Document 2: Mode 9: Babatunde Olusegun Adewale(born June 14, 1975), popularly known by his stage name Modenine, is an English-born Nigerian rapper.In 2014, he released a song titled "Super Human" with Jamaican-American rapper Canibus.
Document 3: Harrysong: Harrison Tare Okiri, better known by his stage name Harrysong, is a Nigerian singer, songwriter and instrumentalist who rose to fame after his tribute song to Nelson Mandela won the "Most Downloaded Callertune Award" at The Headies 2013. Harrysong was born in Warri, Delta State, Nigeria to Ijaw parents but moved to Lagos in 2007 after spending some of his early life in Port Harcourt. Prior to signing to QuestionMark Entertainment, Harrysong used to perform at night clubs until he met Kcee who introduced him to top music personalities. In 2014, Harrysong was nominated in the "Best Pop/R&B Artist of the Year" category at the 2014 Nigeria Entertainment Awards after the release of his chart-topping song "Beta Pikin".
Document 4: Deputy President of the Nigerian Senate: Deputy Senate Presidents of Nigeria Deputy Senate President Term Party Ibrahim Mantu 1999 - 2007 PDP Ike Ekweremadu 2007 - present PDP
Document 5: Vice President of Nigeria: The Vice President of Nigeria is the second - in - command to the President of Nigeria in the Government of Nigeria. Officially styled Vice President of the Federal Republic of Nigeria, the Vice President is elected alongside the President in national elections. The office is currently held by Yemi Osinbajo.
Document 6: Sonu Nigam: Sonu Nigam was born on 30 July 1973 to Agam Kumar Nigam and Shobha Nigam, in the city of Faridabad, Haryana. His father was from Agra and his mother was from Garhwal. His sister Teesha Nigam is also a professional singer.Nigam began his singing career at the age of four, when he joined his father Agam Kumar Nigam on stage to sing Mohammed Rafi's song "Kya Hua Tera Wada". Nigam began accompanying his father on his singing appearances at weddings and parties. He moved to Mumbai with his father to begin his Bollywood singing career at the age of 18. He was trained by Hindustani classical singer Ustad Ghulam Mustafa Khan.Nigam married Madhurima Mishra on 15 February 2002. He has a son named Nevaan.
Document 7: Nigeria: Nigeria is a Federal Republic modelled after the United States, with executive power exercised by the president. It is influenced by the Westminster System model[citation needed] in the composition and management of the upper and lower houses of the bicameral legislature. The president presides as both Head of State and head of the national executive; the leader is elected by popular vote to a maximum of two 4-year terms. In the March 28, 2015 presidential election, General Muhammadu Buhari emerged victorious to become the Federal President of Nigeria, defeating then incumbent Goodluck Jonathan.
Document 8: Age of candidacy: In Nigeria, a person must be at least 35 years of age to be elected President or Vice President, 30 to be a Senator or State Governor, and 25 to be a Representative in parliament.
Document 9: Southampton: The city is home or birthplace to a number of contemporary musicians such as R'n'B singer Craig David, Coldplay drummer Will Champion, former Holloways singer Rob Skipper as well as 1980s popstar Howard Jones. Several rock bands were formed in Southampton, including Band of Skulls, The Delays, Bury Tomorrow, Heart in Hand, Thomas Tantrum (disbanded in 2011) and Kids Can't Fly (disbanded in 2014). James Zabiela, a highly regarded and recognised name in dance music, is also from Southampton.
Document 10: Menlo Park (band): It featured Harper Simon, Paul Simon's son. Also, its drummer was Seb Rochford, who won the BBC Rising Star Jazz Award in 2004 and leads the Mercury Prize-nominated experimental-jazz group Polar Bear.
Document 11: President of the Senate of Nigeria: The President of the Senate is the presiding officer of the Senate of Nigeria, elected by its membership. The Senate President is second in line for succession to the Nigerian presidency, after the Vice President of Nigeria. The current President of the Senate is Bukola Saraki.
Document 12: Harry Styles: Harry Edward Styles (born 1 February 1994) is an English singer, songwriter, and actor. He rose to stardom as a member of the boy band One Direction. Styles grew up in Holmes Chapel, Cheshire, where he performed as a singer with his band White Eskimo. In 2010, Styles auditioned as a solo artist for the British music competition series The X Factor, where he and four other contestants joined to form One Direction. One Direction have since released five albums, performed four worldwide tours, and won several awards. One Direction went on an extended hiatus in January 2016.
Document 13: Singing Melody: Everton Hardweare (born 23 November 1967), better known by his stage name Singing Melody, is a Reggae artist from Kingston, Jamaica. He is known for his abilities as a vocalist, his production work and for combining aspects of Reggae and R&B in his own releases.
Document 14: Georgia State Senate: The presiding officer of the Senate is the President of the Senate. A President Pro Tempore, usually a high - ranking member of the majority party, acts as President in case of the temporary disability of the President. In case of the death, resignation, or permanent disability of the President or in the event of the succession of the President to the executive power, the President Pro Tempore becomes President. The Senate also has as an officer the Secretary of the Senate.
Document 15: United States Senate: The presiding officer of the Senate is the Vice President of the United States, who is President of the Senate. In the Vice President's absence, the President Pro Tempore, who is customarily the senior member of the party holding a majority of seats, presides over the Senate. In the early 20th century, the practice of majority and minority parties electing their floor leaders began, although they are not constitutional officers.
ground_truth: Bukola Saraki
sub_queries: Where was Harrysong from? Answer: Nigeria
who is the president of the senate in Nigeria Answer: Bukola Saraki