The standard modern work on Savonarola is Pasquale Villari's, La Storia di Fra Girolamo Savonarola e de' suoi tempi (Florence, 1887) based on an exhaustive study of the original authorities and containing a number of new documents (English translation by Linda Villari, London, 1889).
His Istoria dei suoi tempi was published in Florence in 1583; a new edition appeared also in Florence in 1872.
But Tacitus, though he mentions the rumours, declares that its origin was uncertain, and in spite of such works as Profumo's Le fonti ed i tempi dello incendio Neroniano (1905), there is no proof of his guilt.
For his life see Ardito, Giovanni Pontano e i suoi tempi (Naples, 1871); for his place in the history of literature, Symonds, Renaissance in Italy.
These are fresh, unaffected accounts, using the predominately slow tempi that seem to have been prevalent in sacred music for this period.