You can look the terms up, that is a start.
The rondo is a recurring to the opening theme, exploring a new, and returning again and again, as
ABACADAEA and so on
A fugue is quite different, and any of Bach's fugues can attest to the exploration of new variations.
http://en.wikipedia.org/wiki/Fugue
What is the difference between a fugue and a rondo?
2 answers
wat websites can i find choirs history