Joseph Haydn does not need an introduction, he was born today, 180 years ago. You will find lots about him at Wikipedia and other sites.
If you want to listen to the most perfect – in the sense of following all rules – classical music, besides Bach, Mozart and Beethoven, Joseph Haydn is your man.
His nicknames have been ‘father of the symphony’ and ‘father of the ‘string quartet’. That should say it all.
He also was a gentleman, with a great sense of humor and he was very caring towards his musicians.
This is brilliantly shown by the following anecdote.