Ah history!
October 1849? One Edgar Allan Poe and one Chopin after all... A year later, Robert Peel (British PM) and Zachary Taylor (US President) died in the same week. Of course there was much less celebrities in the 19th Century, which therefore brings notice to 3 dying in April 1882: Darwin, Emerson and Jesse James! Did Verdi hear of Queen Victoria's death, or William McKinley mourn Toulouse-Lautrec - the former died 5 days after the latter in 1901. Leo Tolstoy and Dr Crippen within the same three days in 1910 - there's two folk who surely never heard of each other!
But yeah, not many before WW2, unless you count April 1912 - a bit of a cheat, given the Titanic, but Bram Stoker died 5 days later, so that is a number of famous folk in one week, even if 6 of them were on the same boat.
Oh well, a modern one then:
July 2007
Boots Randolph
Bill Pinkney
George Melly
Jack Sowards (Wrath of Khan writer)
Peter Tuddenham
Charles Lane
Lady Bird Johnson
Nigel Dempster
Kelly Johnson (Girlschool)
Kronus
Ivor Emmanuel
Kai Seigbahn
Doon Arden
Jesus de Polanco
Tammy Faye Messner
Danny Bergara
John Normington
Tom Snyder
Mike Reid
Phil Drabble
Bill Walsh
Tam McGraw (gangster)
Ingmar Bergman
Michelangelo Antonioni
Bar the stock wrestler, all of them got BBC/Guardian obits, and the last 8 were all announced on the same day practically.