Question: Who wrote the folk song recorded by an English rock band that released it's debut album in the United States on January 12, 1969?

full_context: Document 1: Physical Graffiti: Physical Graffiti is the sixth studio album by the English rock band Led Zeppelin, released as a double album on 24 February 1975 by their newly founded imprint label Swan Song Records. The band wrote and recorded eight new songs for the album at Headley Grange, which stretched the total time of the record beyond the typical length of a single LP, so the band decided to make "Physical Graffiti" a double album by including unreleased tracks from earlier recording sessions: one outtake from "Led Zeppelin III," three from "Led Zeppelin IV," and three from "Houses of the Holy", including the unused title track from the latter album.
Document 2: Led Zeppelin: Led Zeppelin were an English rock band formed in London in 1968. The group consisted of guitarist Jimmy Page, singer Robert Plant, bassist and keyboardist John Paul Jones, and drummer John Bonham. The band's heavy, guitar-driven sound has led them to be cited as one of the progenitors of heavy metal, though their unique style drew from a wide variety of influences, including blues, psychedelia, and folk music.
Document 3: Led Zeppelin discography: The discography of the English rock band Led Zeppelin consists of nine studio albums, four live albums, nine compilation albums, 16 singles and eight music downloads. Formed in London in 1968, the group consisted of guitarist Jimmy Page, singer Robert Plant, bass player John Paul Jones, and drummer John Bonham. The band pioneered the concept of album-oriented rock and often refused to release popular songs as singles. Nevertheless, four of their ten songs that reached the Hot 100 had no mention of the title in the lyrics: "Immigrant Song", "Black Dog", "Over the Hills and Far Away", "D'yer Mak'er". Their debut album, "Led Zeppelin" (1969), released by Atlantic Records, charted at number six on the UK Albums Chart and at number ten on the United States "Billboard" 200. It received several sales certifications, including an 8 times multi-platinum from the Recording Industry Association of America (RIAA) and Diamond from the Music Canada. Led Zeppelin's second studio album, "Led Zeppelin II", recorded when the band were on tour, was released a few months after the first. It reached number one in several countries, including the UK and the US, where it was certified 12 times multi-platinum. The album produced Led Zeppelin's most successful single, "Whole Lotta Love", which peaked at several music charts in the top 10. "Led Zeppelin III" (1970) was a softer, more folk-based effort compared to the hard rock of the band's previous releases. It also peaked at number one in the UK and in the US.
Document 4: Babe I'm Gonna Leave You: "Babe I'm Gonna Leave You" is a folk song written by Anne Bredon (then known as Anne Johannsen) in the late 1950s. It was recorded by Joan Baez (credited and became widely popular as "traditional") and released on her 1962 album "Joan Baez in Concert, Part 1"; and by the English rock band Led Zeppelin, who included it on their 1969 debut album "Led Zeppelin".
Document 5: Joan Baez: Joan Chandos Baez ( ; born January 9, 1941) is an American folk singer, songwriter, musician, and activist whose contemporary folk music often includes songs of protest or social justice, Baez has performed publicly for over 59 years, releasing over 30 albums. Fluent in Spanish and English, she has recorded songs in at least six other languages. She is regarded as a folk singer, although her music has diversified since the counterculture days of the 1960s and now encompasses everything from folk rock and pop to country and gospel music. Although a songwriter herself, Baez generally interprets other composers' work, having recorded songs by the Allman Brothers Band, the Beatles, Jackson Browne, Leonard Cohen, Woody Guthrie, Violeta Parra, The Rolling Stones, Pete Seeger, Paul Simon, Stevie Wonder, Bob Dylan and many others. In recent years, she has found success interpreting songs of modern songwriters such as Ryan Adams, Josh Ritter, Steve Earle and Natalie Merchant. Her recordings include many topical songs and material dealing with social issues.
Document 6: Kozmic Blues: "Kozmic Blues" is a song from Janis Joplin's "I Got Dem Ol' Kozmic Blues Again Mama!" album, her first after departing Big Brother and the Holding Company. It was a part of Joplin's set at Woodstock Festival in 1969. Although the concert as a whole is not regarded as Joplin at her best, that specific performance became very popular and was released on "The Essential Janis Joplin".
Document 7: Led Zeppelin (album): Led Zeppelin is the eponymous debut studio album by English rock band Led Zeppelin, released on 12 January 1969 in the United States and on 31 March 1969 in the United Kingdom by Atlantic Records. Featuring integral contributions from each of the group's four members, the album was recorded in October 1968 at Olympic Studios in London and established their fusion style of both blues and rock music. It also attracted a large and devoted following to the band; Zeppelin's take on the emerging hard rock sound endeared them to parts of the counterculture on both sides of the Atlantic Ocean.
Document 8: Led Zeppelin IV: The untitled fourth studio album by English rock band Led Zeppelin, commonly known as Led Zeppelin IV, was released on 8 November 1971 by Atlantic Records. Produced by guitarist Jimmy Page, it was recorded between November 1970 and January 1971 at several locations, most prominently the Victorian house Headley Grange.
Document 9: Bald Headed Woman: "Bald Headed Woman" is a traditional blues song covered and released by The Kinks on their eponymous debut album in 1964 and The Who in 1965 as the b-side of "I Can't Explain". It is claimed that Jimmy Page, as a session guitarist, played lead guitar on "Bald Headed Woman" on both The Kinks and The Who versions. However Page is officially credited with playing 12 string acoustic guitar on two tracks on The Kinks' debut album, "I'm a Lover Not a Fighter" and "I've Been Driving On Bald Mountain" and possibly on the b-side "I Gotta Move", but not on "Bald Headed Woman".
Document 10: I Got Dem Ol' Kozmic Blues Again Mama!: I Got Dem Ol' Kozmic Blues Again Mama! is a 1969 studio album by Janis Joplin. It was the first solo studio album Joplin recorded after leaving her former band, Big Brother and the Holding Company, and the only one released in her lifetime ("Pearl" was released 3 months after Joplin's death).
Document 11: Joan (album): Joan is a 1967 album by Joan Baez. Having exhausted the standard voice/guitar folksong format by 1967, Baez collaborated with composer Peter Schickele (with whom she'd worked on the 1966 Christmas album, "Noël"), on an album of orchestrated covers of mostly then-current pop and rock and roll songs. Works by Donovan, Paul Simon, Tim Hardin, the Beatles, and Richard Fariña were included, as well as selections by Jacques Brel and Edgar Allan Poe.
Document 12: Led Zeppelin II: Led Zeppelin II is the eponymous second studio album by the English rock band Led Zeppelin, released on 22 October 1969 in the United States and on 31 October 1969 in the United Kingdom by Atlantic Records. Recording sessions for the album took place at several locations in both the United Kingdom and North America from January to August 1969. The album's production was credited to the band's lead guitarist and songwriter Jimmy Page, and it also served as Led Zeppelin's first album to utilise the recording techniques of the engineer Eddie Kramer. Incorporating several elements of blues and folk music, "Led Zeppelin II" exhibited the band's evolving musical style of blues-derived material and their guitar riff-based sound. It has been described as the band's heaviest album.
Document 13: Barbara Ann: "Barbara Ann" is a song written by Fred Fassert that was first recorded by the Regents as "Barbara-Ann". Their version was released in 1961 and reached #13 on the "Billboard" Hot 100 chart. The most famous cover version was recorded in 1965 by the Beach Boys, issued as a single from their album "Beach Boys' Party!" with the B-side "Girl Don't Tell Me".
Document 14: Are You Experienced: Are You Experienced is the debut studio album by English-American rock band the Jimi Hendrix Experience. Released in 1967, the LP was an immediate critical and commercial success, and it is widely regarded as one of the greatest debuts in the history of rock music. The album features Jimi Hendrix's innovative approach to songwriting and electric guitar playing which soon established a new direction in psychedelic and hard rock music.
Document 15: It's All Over Now, Baby Blue: "It's All Over Now, Baby Blue" is a song written and performed by Bob Dylan and featured on his "Bringing It All Back Home" album, released on March 22, 1965 by Columbia Records ("see" 1965 in music). The song was recorded on January 15, 1965 with Dylan's acoustic guitar and harmonica and William E. Lee's bass guitar the only instrumentation. The lyrics were heavily influenced by Symbolist poetry and bid farewell to the titular "Baby Blue." There has been much speculation about the real life identity of "Baby Blue", with possibilites including Joan Baez, David Blue, Paul Clayton, Dylan's folk music audience, and even Dylan himself.
ground_truth: Anne Bredon