From Societas Magica Newsletter Issue 39:

"The British Library’s Sloane collection includes a series of thirty-four notebooks,predominantly concerned with alchemical and medical topics, compiled by an anonymous diarist sometime around the end of the sixteenth century. The notebook manuscripts in question have been most comprehensively studied by Anke Timmermann and David Evett. Evett’s contribution focuses especially on six of the notebooks that include a series of programs for the execution of allegorical paintings more concerned with social and political themes than iatrochemistry. The only direct clue to the compiler’s identity is the initials “C. S.” inscribed on a page pertaining to one of the aforementioned allegories. However, copious circumstantial evidence points to a strong possibility that C. S. is, in fact, Charles Sledd, apothecary, anti-Catholic spy and informer for Francis Walsingham at home and abroad, and sometime acquaintance of John Dee. In what follows, I will lay out some evidence for this identification."


Brian Johnson.

https://societasmagica.org/userfiles/fil...sue_39.pdf

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https://www.routledge.com/subjects

A profusely-illustrated "lesson" on Bosch's triptych with, towards the end, a brief reference to alchemy.

Marie Porterfield


https://dc.etsu.edu/cgi/viewcontent.cgi?...iation-oer

Shades of Ungodliness: Satie, the Occult, and the Flight from Reason

Lindsey MacChiarella

"Faced with a collapse of orthodox religious ideals precipitated by the technological revolution in the mid-nineteenth century, Satie and many in the  Western world took refuge in unorthodox occult religions during the fin de siècle. Avant-garde artists and composers found inspiration in these irrational and imaginative religions, and occult groups often acted as artistic patrons. The Rose+Croix Catholique, with whom Satie collaborated for two years, was  a particularly influential supporter of new Impressionist and Symbolist  movements."

https://diginole.lib.fsu.edu/islandora/o...m/PDF/view

"Studies in Delius’ social milieu during the 1880s and 1890s suggested that both Delius and his closest friends were pursuing aspects of esoteric knowledge influential on his early works. Thus the operas Irmelin and the Magic Fountain were each laid out as comprehensive alchemical allegories, and confirm that Delius had been strongly attracted to alchemical lore and symbolism sometime before he first met Strindberg."

Critchett, Clive Ian (2017) Proportion and the esoteric: Frederick Delius and his music. Doctoral thesis (PhD), The Royal Northern College of Music in collaboration with Manchester Metropolitan University. 

https://e-space.mmu.ac.uk/622566/

Alchemical Harmonaia: An Exploration of Alchemical Modes and other Symbols in Music

JR Glosson

"Music and the Ineffable or Mystical world have always been tied hand in hand. The Greek Philosophers believed music to be the second greatest science of the quadrivium – second only to astronomy in the ability to capture the essence of the universe. Signs and symbols permeate mysticism and initiatory societies, such as the Rosicrucian and Masonic fraternities. The exploration of these signs and their symbolic use within these mystical and initiatory societies has yet to have been expounded upon in recent scholarship. Mysticism in an alchemical, or hermetic, sense has had little attention in the music-theoretical studies. This thesis will start filling this void."

https://digital.library.txst.edu/items/c...93fe8/full

https://www.cabinet.ox.ac.uk/jan-van-der...atory-1570


   

Many public domain books available for full-text inspection and download at Hathi Trust:


https://catalog.hathitrust.org/Search/Ho...=100&ft=ft

Undated. Oil on Copper.

   

"The purpose of this thesis is to analyze the use of alchemy within the work of Rebecca Horn, to elucidate its presence in her work, and to illuminate its purpose as a personal philosophy and as a creative tool. The use of alchemy within Horn's work occurs as a process of revelation and transformation. Alchemy is revealed as a spiritual philosophy and as an interpretative system through the changes that occur in Horn's oeuvre."

By Douglas Dunlop

https://digital.library.unt.edu/ark:/675...adc278016/

Full text available at pdf button

More about Rebecca Horn here:
https://www.tate.org.uk/art/artists/rebecca-horn-2269