Work will be offered without guarantee from the collection of the late Modernist composer Giancinto Scelsi

The Grace House Mural becomes the first and only such site-specific work by the artist to be sold at auction

How a work of art comes to auction is far from a simple process and its place in the eventual sale order is crucial

Can the quality of the smaller works coming up during "gigaweek" quell economic jitters?

Our pick of highlights from the next fortnight's auctions and fairs

Our pick of highlights from upcoming auctions and fairs

Rowland Emett's Cloud Cuckoo Valley automata will be for sale at Bonhams in September and on view in August

Our pick of highlights from London Art Week exhibitions and auctions, including an export-barred Renaissance cabinet and an uncharacteristically cheery Ribera

Post-war and contemporary sale in New York also produced a big sale for Robert Rauschenberg and new records for Louise Bourgeois and Jonas Wood

Our pick of highlights from upcoming auctions

We talk to Marc Spiegler, global director of Art Basel; discuss the forgotten artist Richard Lin; and speak to the curators of a New York exhibition on the ancient Middle East. Produced in association with Bonhams, auctioneers since 1793.

Our picks from upcoming fairs and auctions in the next fortnight

Our highlights of works being sold over the next fortnight

The late pianist’s 1981 annotated score of Bach’s Goldberg Variations is the first of his manuscripts to come to market

The auction houses sell more than 80% of works priced over $1m at auction—can an underdog ever wrestle market share away from them?

The auction houses' bottom lines suffered from unsold lots, continuing a trend of top-lot discernment during New York’s fall sales

We talk to David Hockney about Portrait of an Artist (Pool with Two Figures), which broke an auction record this week, selling at Christie's New York for $90.3m with fees. Produced in association with Bonhams, auctioneers since 1793.

Middle Eastern and South Asian works owned by embattled Dubai-based private equity firm carry much lower estimates than prices paid a decade ago

Our pick from this week's fairs and auctions

On the eve of the 1-54 fair for contemporary African art, we talk to an artist, a curator, an art fair founder, a gallerist and an auctioneer about the long overdue recognition of the diverse art of a continent. Produced in association with Bonhams, auctioneers since 1793.

The British auction house brings in former Sotheby’s financial executive Bruno Vinciguerra as part of the deal

Christie’s introduces day sale format and established names give way to new talent

Advisory group NM Rothschild has reportedly been brought in to oversee a possible sale of the British auction house

The heads of Christie's, Bonhams and Phillips speak on market shifts, challenges and why they believe their model will succeed