Some context: Steeleye Span are an English folk rock band formed in 1969. Still active today, along with Fairport Convention, they are amongst the best known acts of the British folk revival, and were among the most commercially successful, thanks to their hit singles "Gaudete" and "All Around My Hat". They had four Top 40 albums and achieved a certified gold record with sales of "All Around My Hat". Throughout their history, Steeleye Span have seen many personnel changes.
For much of the 1980s, the members of the band tended to focus on outside projects of various sorts. Johnson opened a restaurant and then studied for a degree in psychology at the University of Hertfordshire. Pegrum ran a music studio. Prior and Kemp devoted much energy to their own band (The Maddy Prior Band; see Maddy Prior (solo albums)), recording 4 albums, and also had children together. The result was that the band's output dropped sharply, producing only three albums over the space of ten years (including a concert album), although the band continued touring.  After a quiet spell, the group's 12th studio album (and first without Tim Hart) Back in Line was released on the Flutterby label in 1986. With no "relaunch" as such, the band retained a low profile, although their recording of "Blackleg Miner" (previously an obscure song from an 1844 strike) became a political anthem for the NUM during the miners' strike of 1984-5 and was used to intimidate working miners. Steeleye Span continued to perform the song live and included a different version on their 1986 release Back in Line, which put greater stress on the line that threatens death against blacklegs.  In 1989, two long-term members departed. One was bassist Rick Kemp, who needed to recover from a serious shoulder injury, exacerbated by playing bass on stage. His eventual replacement (after two tours, each with a different bassist) was Tim Harries, who was brought in less than two weeks before the band was scheduled to start a tour. A friend of Pegrum's, Harries was a self-taught rock bassist, as well as a classically trained pianist and double bassist. With Harries on board, Steeleye released Tempted and Tried (1989), an album that formed the basis for their live set for many years to come.  Not long after recording Tempted, drummer Nigel Pegrum emigrated to Australia for personal relationship reasons. He was replaced by eccentric drummer Liam Genockey of Gillan, easily identified by his long, plaited beard. He and Knight were simultaneously members of "Moire Music", a free-jazz band with a classical flavour, led by Trevor Watts. Unlike Pegrum, who employed a traditional rock drumming style, Genockey favoured a more varied drumming style, influenced by both Irish and African drumming, in which he hit, brushed, and rubbed the various surfaces of his drums and cymbals, creating a more varied range of sounds. Consequently, when the band embarked on their 20th Anniversary Tour, they did so with a totally new rhythm section.  Both Harries and Genockey were interested in experimenting with the band's sound, and they helped re-energise the other members' interest in Steeleye. The band began reworking some of their earlier material, seeking new approaches to traditional favourites. For example, Johnson experimented with an arrangement of "Tam Lin" that involved a heavy Bulgarian influence, inspired by Eastern European versions of the Tam Lin legend. In 1992, the band released Tonight's the Night...Live, which demonstrates some of this new energy and direction. The band continued to tour the UK every year, and frequently toured overseas as well.
What were the wilderness years?
A: 
Some context: "Hound Dog" is a twelve-bar blues song written by Jerry Leiber and Mike Stoller. Recorded originally by Willie Mae "Big Mama" Thornton on August 13, 1952, in Los Angeles and released by Peacock Records in late February 1953, "Hound Dog" was Thornton's only hit record, selling over 500,000 copies, spending 14 weeks in the R&B charts, including seven weeks at number one. Thornton's recording of "Hound Dog" is listed as one of the Rock and Roll Hall of Fame's "500 Songs That Shaped Rock and Roll", and was inducted into the Grammy Hall of Fame in February 2013. "Hound Dog" has been recorded more than 250 times. The best-known version is the July 1956 recording by Elvis Presley, which is ranked number 19 on Rolling Stone magazine's list of the 500 Greatest Songs of All Time; it is also one of the best-selling singles of all time.
Two records were released that were neither cover versions of nor answers to Thornton's release, yet used a similar melody without any attribution to Leiber and Stoller. The first was Smiley Lewis's "Play Girl", credited to D. Bartholomew and released by the Imperial Records label (Imperial 45-5234) by the end of March 1953. Described as a "stomping uptempo boogie rocker", it began: "You ain't nothin' but a Play Girl / Staying out all night long". In April 1955, female impersonator Jesse "Big 'Tiny'" Kennedy recorded "Country Boy" accompanied by His Orchestra that was released by RCA's Groove Records (Groove 4G-0106) by May 21. While credited solely to Kennedy, this song has a similar melody to "Hound Dog": "'Country Boy' has a deceptively slouching flip on the 'Hound Dog' motif - this time with Tiny proclaiming proudly that he 'ain't nothing but a country boy'".  In the early 1970s Robert Loers, owner of Dutch label Redita Records, found a song with the same melody as "Hound Dog" called "(You Ain't Nuttin' But a) Juicehead" on an anonymous acetate at Select-o-Hits, the Memphis distributorship owned by Sam Phillips' brother, Tom, where Sun artifacts were stored.  When Juice Head first appeared on a Redita Records LP [in 1974], it was credited to Rosco Gordon. But it's not Rosco. It simply is not him. Really. Even Rosco confirmed that. It might not even be a Memphis Recording Service demo. Just substitute the words "Hound Dog" for "Juice Head" and what have you got? Of course the inspiration for this song came from Big Mama Thornton's "Hound Dog" or perhaps even from Rufus Thomas' "Bear Cat". But the song's other parent is Eddie Vinson's slowed down "Juicehead Blues" which harks to the previous decade...If indeed this originated from Sam Phillips' studio, it was nothing that Phillips needed to touch because it was another lawsuit waiting to happen."  Philip H. Ennis sees "Two Hound Dogs", which was recorded on May 10, 1955, by Bill Haley & His Comets (Decca 29552), as a response to Thornton's recording. While not an answer record in the traditional sense, the lyric characterized "Rhythm" and "Blues" as the titular "Two Hound Dogs," an apparent testament to the stature of "Hound Dog."
Who did the last riff
A:
You Ain't Nuttin' But a) Juicehead" on an anonymous acetate at Select-o-Hits, the Memphis distributorship owned by Sam Phillips' brother,