A quodlibet is a piece of music which combines several different melodies in counterpoint, usually popular tunes, and often in a light-hearted manner. A very famous example of a quodlibet is at the end of Bach's Goldberg Variations. Another example is Galimathias Musicum, a 17 part quodlibet composed by Wolfgang Amadeus Mozart when he was about 10 years old.
... was the son of Philip I and Joanna of Castile and grandson of Ferdinand II of Aragon and Isabella I of Castile and of Maximilian I, Holy Roman Emperor.
Charles was born ...