The 150th anniversary celebrations of Florence, Capital of the Kingdom of Italy (1865-2015) create an opportunity to know and appreciate the voices of the two precious organs preserved in the basilica of San Lorenzo, and the music composed by musicians active in Florence. The organ built by Fratelli Serassi in 1864, with more than 60 registers and three keyboards, is one of the most impressive and unique of its time. The Renaissance-era organ dates to the mid-15th c. The recording features Florentine works from the Renaissance, Classical and Romantic eras, many of which are world premieres.