This is my appraisal on Gerald Murnane, the final candidate I'm going to write.
A perfect definition of a great writer/musician or artist is that he/she grows, exploring the world with different, flexible approach to illumine the factors constituting existence. Since we are discussing Literature, I'll list some of these writers.
Writers like Samuel Beckett, for example, has three dimensions or phases: Modernist epoch which culminates in Murphy, his first celebrated work, Existential epoch which culminates in Waiting for Godot and Krapp's Last Tape, Post-Modernist epoch which culminate in Watt. Same can be spoken for Henry James, the first period which culminate in Portrait of a Lady in 1881, the second phase which culminates in The Bostonians, and the final phase, the modernist which produces Golden Bowl (the work of his I've read) and The Ambassadors, and Shakespeare: Comedy (As You Like It), Tragedy (Hamlet, Julius Caesar, King Lear, Romeo and Juliet), Tragic-Comedy (The Tempest). While some other writers works can be divided into two branches. Works of Soyinka, for example, can be divided into two phases: the more accessible works like Jero Plays and Lion and the Jewel, and the more philosophical works with abstruse language and style, like Madmen and Specialists, Death and the King's Horseman, A Dance of the Forests and his novel The Interpreters, Graham Greene, which works are categoried under environs of political/espionage: The Quiet American, The Comedians, or philosophical/theologian perspective: The End of the Affair, Brighton Rock, or Mahfouz, which works grouped under social/realist narrative: Palace Walk, Karnak Cafe, or philosophical, Journey of Ibn Fattouma.
In the case of Gerald Murnane, his works can be divided into two: the Proustian and Patrick White (Tamarisk Row, The Plains) and Beckett and Borges (Border Districts, Barley Patch). His works, written in long skeins of ruminative prose with marvelous insight and depth, are essayistic meditations of his memory, tracing the ordrinariness of lost time narrated beautifully in an Australian landscape (the influence of Proust and Patrick White, works set in Melbourne), fusing it with verisimilitude of recurring abstractions (horse races, stained glass windows) which he uses to capture, perfectly and dexterously, the Lost time. The major theme in his writing is the impermeance of memory, and, in his second phase which began with Barely Patch (the White and Proustian first period culminating in The Plains, a work I've not read yet but have read the reviews from members of this forum), exploration and views on his writing and life as a house husband, drawing from his personal experience, sometimes through metafictional technique (Borges and Beckett's influences becoming more visible in this period).
A writer of few works all written with superb insight, depth and power, Murnane is an incredible writer who, I must compare, to other giants of modern fiction: Kraszhnarhokai, Kadare and Cormac McCarthy, to list just a few names.