There is a superb cantoria (strictly speaking a balcony for solo singers, but here an organ loft) by Antonio Raggi over the two transept side chapels. There is a matching cantoria in the opposite, left hand end of the transept. Below the curving balustrade is the coat-of-arms of Pope Alexander VII, supported by a lively angel in stucco helped by a putto. The present organ is modern, made by Carlo Vegezzi Basso in 1906. The organ case was designed by Bernini.