Sidney-Fryer had researched composer Cesare Pugni and the history of Romantic Ballet since the 1950s. In 1980 he started writing what he called his "
magnum opus" of ballet history,
The Case of the Light Fantastic Toe: The Romantic Ballet and Signor Maestro Cesare Pugni. During the 1990s Sidney-Fryer focused primarily on writing that project. In August 1998 he moved from Sacramento to Los Angeles to share a home with his friend Rah Hoffman. While working on his ballet book, Sidney-Fryer continued to perform and to write smaller projects and poetry. He later wrote: "The fifteen years that I passed with Rah in [the Los Angeles suburb of] Westchester turned unexpectedly into the single happiest period in my life, and certainly the most productive." While living in Los Angeles, Sidney-Fryer's next two books of poetry,
Songs and Sonnets Atlantean: The Second Series and
Songs and Sonnets Atlantean: The Third Series, were published. All known critical evaluations of
The Second Series were favorable. Literary historian
S. T. Joshi stated: “This remarkable collection of poems and prose poems displays Sidney-Fryer as an assured master of many poetic forms—the
quatrain, the sonnet, the ode, and especially the alexandrine, which has become his signature metre—as well as a fantastic imagination that, to be sure, draws upon the work of [Clark Ashton] Smith, [Ambrose] Bierce, and the Elizabethans but remains distinctively his own. … It displays all the virtues we have come to expect from Sidney-Fryer: felicitous word-choice, precision in metre, and especially a vibrant, exotic imagination that vivifies realms of fantasy into living realities." In England, novelist
Brian Stableford summarized the book's contents: “The metafictional stratification of the whole body of work is fascinating in its depth and complexity, moving from the bedrock of a beautifully ornate version of the legendary Atlantis through the Elizabethan fabulations of Edmund Spenser, the neo-paganism of the French Parnassians and the unrepentant fantasizing of the American Bohemians of the West Coast, to a fresh and deftly-stylized present day. Such scope is rare; coherence of vision and supple exploitation of exotic methods within such scope is even rarer. The accomplished dexterity with which so many innovative links are forged and sewn is remarkable, and the whole tapestry is a brilliant achievement.
Songs and Sonnets Atlantean: The Third Series was published by Phosphor Lantern Press, Sidney-Fryer's own publishing company. He named his company after a line in a poem by Clark Ashton Smith: Our phosphor lamps may serve as well as anyAlong the rutted roads to Charon's wharf. In 2004, Sidney-Fryer's translation from French of fantasy prose poems by Aloysius Bertrand,
Gaspard de la Nuit: Fantasies in the Manner of Rembrandt and Callot, was published. The
Los Angeles Times declared: "The book is nothing less than an antidote for a flagging imagination, with words that are, in Bertrand's words, transporting … What is written here did not come easily: it has the ring of deep ore. There is not a hollow phrase throughout."
Gahan Wilson wrote: "I am very grateful to Fryer, very grateful indeed, for it is a marvelous work that I have very much enjoyed reading and intend to read and study many times again now that it has been put within my grasp." Critic Jesse F. Knight said: "Donald Sidney-Fryer has done a brilliant job of translating this text; he also provides a meticulous look at the life of Bertrand, as well as of his work." Literary historian Scott Connors wrote: "Donald Sidney-Fryer has provided a scintillating and accessible translation of this monument to French Romanticism that puts on display its affinities for the fantastic, the grotesque, and the medieval." Publisher
Tartarus Press released the book in England. British author
Brian Stableford said: "Sidney-Fryer, the last surviving member of the Californian neo-Romantic school centered on
George Sterling, is perfectly qualified to adapt the work of a key member of the French Romantic school …" On April 29, 2005, Sidney-Fryer visited New Bedford, Massachusetts--where he had spent his childhood and youth--for the first time in about forty years. He had used his memories of the whaling port to describe his fictional Atlantis. Seeing New Bedford's "centuried magick and historic charm" enchanted him. In 2008, New York publisher
Hippocampus Press released all three volumes of
Songs and Sonnets Atlantean combined into one book:
The Atlantis Fragments: The Trilogy of the Songs and Sonnets Atlantean. Over the next several years, Hippocampus published a steady stream of books by Sidney-Fryer, becoming his most frequent publisher. With his friend Alan Gullette, Sidney-Fryer edited
The Outer Gate: The Collected Poems of Nora May French. In addition to being the most complete collection of French's poems, Sidney-Fryer wrote a 56-page introduction providing extensive biographical information from Sidney-Fryer's years-long friendship with Helen French Hunt, Nora May's sister.
Dana Gioia, former chairman of the National Endowment for the Arts, called
The Outer Gate "a major addition to the study of California literature." British publisher Stanza in 2010 produced
Not Quite Atlantis, a collection of Sidney-Fryer's poems but for one exception not framed as surviving the collapse of the lost continent Atlantis. Most were translations by Sidney-Fryer from French poets or were poems Sidney-Fryer wrote to individual people, including Edmund Spenser, Clark Ashton Smith, George Sterling, August Derleth, Algernon Charles Swinburne, Ambrose Bierce, and other writers and friends. In 2011 Sidney-Fryer self-published (under his Phosphor Lantern Press)
The Golden State Phantastics: The California Romantics and Related Subjects, an anthology collecting 33 of his literary essays and reviews from the 1960s through the 2000s, plus one new essay about Nora May French and a new foreword. Sidney-Fryer's goal for this book was "defining in critical terms the survival of not just the Late Romanticism from the 1800s but also the Modern Romanticism of the 1900s on into the twenty-first century." The book has been frequently cited by other authors writing about California history, literature, and writers. It was successful enough for Hippocampus Press to issue a second edition the next year. Also that year Sidney-Fryer self-published
The Atlantis Fragments: A Novel, a companion to this
Songs and Sonnets Atlantean Trilogy. In 2012, Hippocampus Press published a second edition of the novel. Hoffman died in February 2013. Sidney-Fryer moved back to Sacramento in June 2013. ==2014-present: Autobiography, ballet history, and more==