Misc: What does the acronym "bios" stand for?

Questions

French writer George Sand is remembered for her affair with which composer ?

Bach's "Goldberg Variations" are best known today through the recording of this Canadian pianist. ?

What composition was structured on a single theme repeated over and over ?

This famours astronomer was the son of a composer. ?

What poem by Goethe inspired music by Wagner, Schumann, Gounod, and Liszt ?