Question: Europop included the lead single, released on what date?
Sentence (from "Blue (Da Ba Dee)"): The song is the group's most popular single, reaching number one in many countries such as Ireland, the United Kingdom, the Netherlands, France, Sweden, Switzerland, New Zealand, Finland, Norway, Australia, and Germany, as well as reaching number six on the "Billboard" Hot 100 in the United States.
Relevant evidence: No