Sir Paul McCartney was "shocked in a very pleasant way" by the contributions to 'McCartney III Imagined'.
The former Beatles legend released the star-studded collection, which features the likes of Idris Elba, Damon Albarn, St. Vincent and more, last week.
And the 78-year-old music icon has compared being sent the new interpretations of the tracks from his 18th solo album as like receiving "a Christmas gift" each time.
McCartney is quoted by The Sun newspaper's Bizarre column as saying: "It started by people asking me if I had any bonus tracks and I said, 'No, not really, 'McCartney III' is like a giant bonus track.'