Five singles were released from the album, including Madonna's first US number-one "Like a Virgin" and her first UK number-one "Into the Groove". To promote the album, she embarked on The Virgin Tour, which had shows in cities of North America only. "Like a Virgin" has attained significance as a cultural artifact of the 1980s. Madonna proved that she was not a one-hit wonder and was able to provide herself with a permanent footing in the music world. Her songs became a lightning rod for both criticism by conservatives and imitation by the younger female population, especially "Material Girl" and "Like a Virgin". According to author J. Randy Taraborrelli, "Every important artist has at least one album in his or her career whose critical and commercial success becomes the artist's magic moment; for Madonna, "Like a Virgin" was just such a defining moment."