Question: So What was by the singer-songwriter who was drafted into the Eagles to replace the multi-instrumentalist who had what musical background?

Context paragraphs:
The Princes (band): The Princes is an Estonian rock band.  The band was formed in 2009 by Edward Krimm (lead vocals, piano, keyboards) and Jaagup Tormis (drums, percussion, vocals), the grandson of one of the greatest living choral composers Veljo Tormis.  The current lineup consists of Edward Krimm, Jaagup Tormis, Kaur Garšnek (guitar) and Valdur Viiklepp (bass guitar, vocals).  All the members have a musical background and have taken part in other musical groups as well.  Most notably, Jaagup Tormis has played in and , Kaur Garšnek (a son of , a keyboardist of one of the foremost Estonian rock group Ruja) has played in Kreatiivmootor.  Past members of The Princes have included Taavi Paomets, Kostja Tsõbulevski and Madis Viksi.

Tiago Iorc: Tiago Iorczeski (born November 28, 1985) is a Brazilian singer-songwriter and record producer.  As a child he lived in England and in the United States, fact that later determined his choice of singing and writing in English.  Despite having no musical background in his family, Tiago started playing the acoustic guitar at age 8.

Jingo de Lunch: Jingo de Lunch is a German punk band from Kreuzberg, Berlin.  Most members had already a solid musical background, for instance Sepp Ehrensberger had played in the Berliner cult punk rock band called Vorkriegsjugend (1984–85), and also in Zerstörte Jugend with Tom Schwoll.  Yvonne Ducksworth (a Canadian who arrived in Germany in 1983) had previously sung in Combat Not Conform.  Before they gave birth to Jingo de Lunch in April 1987, with the help of Steve Hahn (on drums) and Henning Menke (bass), Tom Schwoll (guitar); Ehrensberger (guitar) and Ducksworth (vocals) played together in Manson Youth.

Rene Paulo: Rene Paulo (born in 1930) is an American pianist.  Born in the rural district of Schofield, Paulo grew up in Wahiawa, Hawaii.  His grandparents on his mother's side were from the Philippines, becoming naturalized US citizens after his grandfather joined the US military.  Rene's musical background is in classical music, and he studied briefly at the Juilliard School of Music in New York with Lonnie Epstein and Gerald Tracy.  He soon branched out into improvisation, listening to jazz pianists such as Art Tatum, Alec Templeton, Fats Waller, Earl "Fatha" Hines, and boogie woogie styles.  He is known as "Hawaii's Favorite and Most Famous Pianist" and has been invited repeatedly to perform in Las Vegas, Los Angeles, and Tokyo.  Paulo played with famous artists like Alfred Apaka, Hilo Hattie, Don Ho and Sandii.  He has played music at a church in Kapolei, Hawaii that was founded by Pastor Danny Yamashiro and is the father of cosmopolitan and versatile saxophonist Michael Paulo.

Way to Go, Einstein: Way to Go, Einstein was a Canadian five-piece indie rock music group formed in 2006 in Vancouver.  Their second LP, "Pseudonym", was released on March 17, 2009 by Submerged Records.  It was recorded over a period of eight months at the band’s studios in New Westminster, Burnaby, and at The Hive Creative Labs.  "Pseudonym" was featured on the college radio top fifty charts in many cities across Canada.  The band, originally composed of members Andrew (Vocals) and Kevin (Guitar), completed its line-up in early 2007.  Each member comes from his own separate musical background, making for an eclectic mix of ambient and at times heavy guitars, melodic vocals and piano, synthesizers, hypnotic bass lines, and creative rhythms.  Way to Go, Einstein's first album Hide and Seek Champion was released in 2007 by Broken Oak Records.  The first single, "Walk Through Fire", created some initial buzz for the band in the Vancouver area.  "Way to Go, Einstein" disbanded peacefully in 2010 after several months of stagnation.  Members Geoff and Kevin later formed synth-pop duo "Fathoms" in 2012.

World Doctors Orchestra: The World Doctors Orchestra (WDO) is an orchestra made up entirely of physicians.  It was established as a non-profit organization in 2007 by Prof. at the Charité University Medical Center in Berlin, Germany with the purpose of combining music with global medical responsibility.  The members are physicians representing almost 50 countries worldwide, many of them with a professional musical background.  The WDO performs usually two to three times a year in various venues and countries around the world donating the concert proceeds to medical aid organizations.

So What (Joe Walsh album): So What is the third solo studio album by the American singer-songwriter and multi-instrumentalist Joe Walsh.  It was released in late 1974 on ABC-Dunhill Records.  It contains hard rock songs such as "Welcome To The Club" and a remake of the Barnstorm track, "Turn To Stone".  It also contains more introspective material such as "Help Me Through the Night" and "Song For Emma", a tribute to Walsh's daughter who had been killed in a car crash the previous year.  On a few tracks, Don Henley, Glenn Frey, and Randy Meisner of the Eagles contributed backing vocals.  Over a year and a half later, Walsh would be drafted into the Eagles to replace founding member Bernie Leadon, playing on their best-selling studio album "Hotel California".  The album was re-issued five years later by MCA Records in 1979.

Janine Kitzen: Janine Kitzen (born 1 March 1978 in Kerkrade, The Netherlands) is a soprano singer in opera and musical theatre.  Although she was born in a family with no real musical background, Kitzen knew from an early age she wanted to build a career in singing.  At the age of ten, she sang her first public solo guided by André Rieu.

Bernie Leadon: Bernard Mathew Leadon III (pronounced "led-un"; born July 19, 1947) is an American musician and songwriter, best known as a founding member of Eagles.  Prior to Eagles, he was a member of three pioneering and highly influential country rock bands: Hearts & Flowers, Dillard & Clark, and the Flying Burrito Brothers.  He is a multi-instrumentalist (guitar, banjo, mandolin, steel guitar, dobro) coming from a bluegrass background.  He introduced elements of this music to a mainstream audience during his tenure with the Eagles.

Miroslav Wanek: Miroslav Wanek (born 7 April 1962) is a Czech poet, musician, and lyricist.  He is the frontman for the avant garde punk rock group Už Jsme Doma, in which he has served as the lead singer and bandleader since 1986, the bassist from 1986–1988, the guitarist and keyboardist since 1988, major composer and co-composer from 1986–2001, and the only composer since 2001.  Prior to Už Jsme Doma, he played bass and sang in the Czech punk rock group FPB (Fourth Price Band), from 1981–1985.  His musical background includes two years of classical piano training and conservatory for writing lyrics.

Supporting paragraphs: So What (Joe Walsh album) Bernie Leadon
Answer: bluegrass