The singer purchased the white 1965 Porsche 356C Cabriolet in 1968 and asked an artist friend to personalise the vehicle with a colourful mural.

Joplin's family members took ownership of the sportscar after her tragic drug overdose death in 1970, and they allowed it to be displayed at the Rock and Roll Hall of Fame and Museum in Cleveland, Ohio from the early 1990s.

However, the vehicle headed to the auction block at Sotheby's New York on Thursday (10Dec15) and sold for more than three times the expected amount of $400,000 (GBP267,000).

"Janis Joplin's 356C is without question one of the most important Porsches of all time," Ian Kelleher, managing director of RM Sotheby's West Coast Division, says. "It's a fantastic automobile that transcends art, pop culture and social movements, and is as groundbreaking and stunning as the renowned singer was herself."