From a Spanish palace songbook Music from the time of Christopher Columbus (1992)

"A treasure as rich as any discovered by Columbus in the New World is the so-called Cancionero de Palacio (Palace Songbook), still preserved after almost five hundred years in the royal palace in Madrid. This elegant, disarmingly petite volume originally contained well over five hundred songs, of which almost 460 survive. Compiled over a period possibly as long as forty years, the Songbook is clearly intended to have been a repository of polyphonic song, most probably of the repertory of the royal court of Ferdinand and Isabella. The link with the royal court has never, in fact, been proven, and rests largely on the evidence of the high proportion of songs attributed to composers who served at least for some of their careers in the royal chapels. A substantial number of the songs, however, bear no ascription at all, and it is possible that this emphasis is misleading." (Hyperion)