Here he started his musical education under the direction of Gaetano Capocci, financed by the Sistine Chapel.
Cesari was overall a remarkable soprano, and although he possessed a veiled voice, he was a master of song with an optimal intonation and an exquisite trill.
In addition to being a soprano at the Sistine Chapel Choir, he was also director of sacred music at several churches of Rome (Santa Lucia al Gonfalone, Santo Spirito in Sassia, etc.
In 1896 he was promoted to vice-director of the Cappella, sometimes substituting for the older maestro Domenico Mustafà.
His voice can be heard, rather faintly, together with those of the other choristers on the Sistine Chapel recordings made by Fred Gaisberg in 1902.