Back in 2008, Sotheby’s auctioned a private collection of various papers and memorabilia belonging to the Belgian singer Jacques Brel, who died in 1972. The notebook below, probably from the 1950s, was used by Brel for draft song lyrics, and was estimated to sell for between 50,000 and 70,000 euros. It’s a nice looking notebook– I love the logo on the cover.
Via Luxist: Jacques Brel’s Notebooks Up For Auction, though the original story and image seem to have disappeared due to changes at that website.