Background: The Illyrians (Ancient Greek: Illurioi, Illyrioi; Latin: Illyrii or Illyri) were a group of Indo-European tribes in antiquity, who inhabited part of the western Balkans.  The territory the Illyrians inhabited came to be known as Illyria to Greek and Roman authors, who identified a territory that corresponds to Croatia, Bosnia and Herzegovina, Slovenia, Montenegro, part of Serbia and most of central and northern Albania, between the Adriatic Sea in the west, the Drava river in the north, the Morava river in the east and the mouth of the Aoos river in the south. The first account of Illyrian peoples comes from the Periplus of Pseudo-Scylax, an ancient Greek text of the middle of the 4th century BC that describes coastal passages in the Mediterranean. The name "Illyrians", as applied by the ancient Greeks to their northern neighbors, may have referred to a broad, ill-defined group of peoples, and it is today unclear to what extent they were linguistically and culturally homogeneous.
Context: Even before the advent of post-modernism, scholars recognized a "difficulty in producing a single theory on the ethnogenesis of the Illyrians" given their heterogeneous nature. Modern scholarship is unable to refer to the Illyrians as a unique and compact people and agrees that they were a sum of ill-defined communities without common origins that never merged to a single ethnic entity.  On the other hand, some past Pan-Illyrian theories have been dismissed by scholars, based as they were on racialistic notions of Nordicism and Aryanism. The specific theories have found little archaeological corroboration, as no convincing evidence for significant migratory movements from the Luzatian culture into the west Balkans have ever been found. Rather, archaeologists from the former Yugoslavia highlighted the continuity between the Bronze and succeeding Iron Age (especially in regions such as Donja Dolina, central Bosnia-Glasinac, and northern Albania (Mat river basin)), ultimately developing the so-called "autochthonous theory" of Illyrian genesis. The "autochthonous" model was most elaborated upon by Alojz Benac and B. Covic. They argued (following the "Kurgan hypothesis") that the 'proto-Illyrians' had arrived much earlier, during the Bronze Age as nomadic Indo-Europeans from the steppe. From that point, there was a gradual Illyrianization of the western Balkans leading to historic Illyrians, with no early Iron Age migration from northern Europe. He did not deny a minor cultural impact from the northern Urnfield cultures, however "these movements had neither a profound influence on the stability.. of the Balkans, nor did they affect the ethnogenesis of the Illyrian ethnos".  Aleksandar Stipcevic raised concerns regarding Benac's all-encompassing scenario of autochthonous ethnogenesis. He points out "can one negate the participation of the bearers of the field-urn culture in the ethnogenesis of the Illyrian tribes who lived in present-day Slovenia and Croatia" or "Hellenistic and Mediterranean influences on southern Illyrians and Liburnians?". He concludes that Benac's model is only applicable to the Illyrian groups in Bosnia, western Serbia and a part of Dalmatia, where there had indeed been a settlement continuity and 'native' progression of pottery sequences since the Bronze Age. Following prevailing trends in discourse on identity in Iron Age Europe, current anthropological perspectives reject older theories of a longue duree (long term) ethnogenesis of Illyrians, even where 'archaeological continuity' can be demonstrated to Bronze Age times. They rather see the emergence of historic Illyrians tribes as a more recent phenomenon - just prior to their first attestation.  The impetus behind the emergence of larger regional groups, such as "Iapodes", "Liburnians", "Pannonians" etc., is traced to increased contacts with the Mediterranean and La Tene 'global worlds'. This catalyzed "the development of more complex political institutions and the increase in differences between individual communities". Emerging local elites selectively adopted either La Tene or Hellenistic and, later, Roman cultural templates "in order to legitimise and strengthen domination within their communities. They were competing fiercely through either alliance or conflict and resistance to Roman expansion. Thus, they established more complex political alliances, which convinced (Greco-Roman) sources to see them as 'ethnic' identities." Contemporary perspectives again highlight that the term "Illyrian" was a 'catch-all' exonym used by the Greeks and Romans to denote diverse communities beyond Epirus and Macedonia. Each was differentially conditioned by specific local cultural, ecological and economic factors; none of which fall into a compact, unitary "Illyrian" narrative.
Question: What was their ethnicity?
Answer: The specific theories have found little archaeological corroboration, as no convincing evidence for significant migratory movements from the Luzatian culture into the west Balkans have ever been found.

Background: William Taylor (July 24, 1921 - December 28, 2010) was an American jazz pianist, composer, broadcaster and educator. He was the Robert L. Jones Distinguished Professor of Music at East Carolina University in Greenville, and from 1994 was the artistic director for jazz at the John F. Kennedy Center for the Performing Arts in Washington, D.C. A jazz activist, Taylor sat on the Honorary Founders Board of The Jazz Foundation of America, an organisation he started in 1989, with Ann Ruckert, Herb Storfer and Phoebe Jacobs, to save the homes and the lives of America's elderly jazz and blues musicians, later including musicians who survived Hurricane Katrina. Taylor was also a jazz educator, who lectured in colleges, served on panels and travelled worldwide as a jazz ambassador.
Context: In 1952 Taylor composed one of his most famous tunes, "I Wish I Knew How It Would Feel to Be Free", which achieved more popularity with the civil rights movement of the 1950s and 1960s. Nina Simone covered the song in her 1967 album Silk & Soul. The tune is widely known in the UK as a piano instrumental version, used for BBC Television's long-running Film... programme. He made dozens of recordings in the 1950s and 1960s, notably the album with Cuban percussionist Candido Camero, entitled Billy Taylor Trio with Candido, My Fair Lady Loves Jazz, Cross Section and Taylor Made Jazz.  Taylor's broadcast career also thrived. In 1961, he founded New York's Jazzmobile, which provides an arts education program via workshops, master classes, lecture demonstrations, arts enrichment programs, outdoor summer mobile concerts, special indoor concerts and special projects. In 1958, he became the Musical Director of NBC's The Subject Is Jazz, the first ever television series focusing on jazz. The 13-part series was produced by the new National Educational Television Network (NET) and hosted guests including Ellington, Aaron Copland, Bill Evans, Cannonball Adderley, Jimmy Rushing and Langston Hughes.  Taylor also worked as a DJ and program director on radio station WLIB in New York in the 1960s. During the 1960s, the Billy Taylor Trio was a regular feature of the Hickory House on West 55th Street in Manhattan. From 1969 to 1972, he served as the music director for The David Frost Show and was the first African American to lead a talk-show band. Louis Armstrong, Count Basie, Benny Goodman and Buddy Rich were just a few of the musicians who played on the show.  In 1981, Jazzmobile produced a jazz special for National Public Radio, for which the program received the Peabody Award for Excellence in Broadcasting Programs. Jazzmobile's 1990 Tribute Concert to Dr. Taylor at Avery Fisher Hall, part of the JVC Jazz Festival, featured Nancy Wilson, Ahmad Jamal Trio and Terence Blanchard Quintet.
Question: What was he up to during his mid career?
Answer:
In 1952 Taylor composed one of his most famous tunes, "I Wish I Knew How It Would Feel to Be Free