With the singles' accompanying music videos, Madonna furthered her creativity and became known as a leading figure in the format. The music video for "Like a Prayer" was a lightning rod for religious controversy, using Catholic iconography such as stigmata and burning crosses, and a dream about making love to a saint, leading the Vatican to condemn the video and causing Pepsi to cancel Madonna's sponsorship contract. The video for "Express Yourself" was the most expensive video at its release. "Like a Prayer" preceded Madonna's ground-breaking Blond Ambition World Tour. At the end of the 1980s, following the release of the album, Madonna was named "Artist of the Decade" by several publications.