Background: John Charles Wiltshire-Butler (born 1 April 1975), known professionally as John Butler, is an Australian singer, songwriter, and music producer. He is the front man for the John Butler Trio, a roots and jam band, which formed in Fremantle, Western Australia in 1998. The John Butler Trio has recorded five studio albums including three that have reached number one on the Australian charts: Sunrise Over Sea, Grand National and April Uprising. His recordings and live performances have met with critical praise and have garnered awards from the Australian Performing Right Association and Australian Recording Industry Association.
Context: The early sessions for the John Butler Trio's sixth studio album commenced in mid-2013, following the band's largest tour of the US. For the first time in the band's lifetime, the members began with a blank songwriting slate, rather than using the initial ideas of Butler that had been introduced. Butler gathered with Luiters and Bomba at The Compound in Fremantle, Western Australia, which serves as the band's headquarters and the frontman's artistic space, and co-wrote material for the first time, deviating from the Butler-centric process of the past: "I had always brought the material." After contributing a large portion of work towards the album, Bomba eventually left the Compound space to work on his Melbourne Ska Orchestra project and was replaced by Grant Gerathy.  Butler explained in an interview during the band's US tour:  But a lot of these songs on this album I kind of magpied. Magpies are this bird in Australia that takes shiny things from anywhere and builds its nest, and so that's kind of what I do. I'll take a little of my own experience of having some heavy party time with certain friends, and then I'll hear some other stories about addicts or other intense relationships. I'll put them into the mixing pot and make up these characters to explore different possibilities and emotional landscapes.  One of the songs on the album, "Wings Are Wide", was written as a dedication to his grandmother, who gave Butler his grandfather's Dobro guitar that became the foundation for his songwriting. Butler admitted that "I wasn't at all into roots music or playing the slide or anything when I got it, and it sat under my bed for a long, long time." Released in Australia on 8 February 2014, Flesh and Blood was produced by Jan Skubiszewski and features a vocal duet with Ainslie Wills.
Question: Who collaborated with him on the album ?. Whats the answer?
Flesh and Blood was produced by Jan Skubiszewski and features a vocal duet with Ainslie Wills.