Most valuable album
Wu-Tang Clan
Morocco (Marrakesh)

Described as the "first ever private music album" and "a piece of contemporary art", a single copy of hip-hop collective Wu-Tang Clan's (USA) Once Upon a Time in Shaolin... album was manufactured at a cost of about $3 million (£1.9 million) and offered exclusively to one buyer, in what was considered a revolutionary new business model for the music industry. As of 2 December 2014, the 31-track, 128-minute double album, six years in the making and featuring a "unique tapestry of guest performers" including Cher, Redman and soccer players from Barcelona FC, had reportedly attracted bids of up to $5 million (£3.1 million), with the sole copy housed "in a box within a box within a box" at a secret location in Marrakesh, Morocco.