The Master and Margarita
Mikhail Bulgakov
the manuscript burned in chapter 13 and returned intact in chapter 24.
Purgatory
Dante Alighieri
the Casella song that consoles and makes one forget the way (Canto II), the images read in the stone as speech (Canto X), Oderisi and the empty glory of the arts (Canto XI), Bonagiunta and the sweet new style (Canto XXIV), Guinizelli and Arnaut, who pass the praise back and forth (Canto XXVI), the invocation to the Muses (Canto XXIX) and the brake of art that closes the canticle (Canto XXXIII).