On 6 October 2009, he released his fourth studio album Kaleidoscope, which featured artists such as Priscilla Ahn, Calvin Harris, Tegan & Sara and Nelly Furtado.
Dňa 6. októbra 2009 vydal Tiësto svoj štvrtý štúdiový album Kaleidoscope, na ktorom sa podieľali interpreti ako Priscilla Ahn, Calvin Harris, Tegan & Sara a Nelly Furtado.