The six-time Grammy winner's Ducatis and Triumphs will hit the block in November.
Read the full story at Robb Report →
More in LIFESTYLE
Dolce & Gabbana's Sicilian Gamble: Inside the House That Refuses to Sell
Hockney's Sleeping Dachshund Stanley Set to Fetch £2.5 Million at Christie's
Demna Rebuilds Gucci as a Cathedral of Commerce in Milan
