 In addition to this, however, for those parts of the music during which that choir rested was presented a single line consisting of the lowest note being sung at any given time, which could be in any vocal part.Even in early concerted works by the Gabrielis (Andrea and Giovanni), Monteverdi and others, the lowest part, that which modern performers colloquially call "continuo", is actually a "basso seguente", though slightly different, since with separate instrumental parts, the lowest note of the moment in the instrumental parts is often lower than any being sung.The first known published instance of a basso seguente was a book of Introits and Alleluias by the Venetian Placido Falconio from 1575.