I have no clue how well known Satie is in the classical world... I know that during his life he was mostly ignored because he was a pain in the ass . After his death his works became forgotten... But Claude Debussy, Maurice Ravel, Darius Milhaud and Francis Poulenc were all influenced by his works. Later he even influenced John Cage (who is known for using coincidence in his music) in the 40's it was Cage who pointed out how much satie was from before his time... and it was then that ppl started looking at his works again...
I can say whatever I want... just listen to this and I hope you'll understand: