Aqua were relatively quiet during 1999, deciding to concentrate on recording "Aquarius". According to promotional interviews with the group, over 30 songs were recorded for the album, although eventually only twelve made it onto the final version. The group released their second album "Aquarius" in February 2000. The album instantly proved popular with their fan base, despite some changes to their sound. "Aquarius" contained several different musical styles. Tracks such as "Cartoon Heroes" and "Bumble Bees" preserved the pop sound of their debut album. "Cartoon Heroes" was released as the first single, and sold well across Europe and Australia, reaching #1 in Denmark, #7 in the United Kingdom, and #16 in Australia. The song is often best remembered for its music video. Aqua released their follow-up single "Around the World" in June 2000, although it was not as successful as "Cartoon Heroes", peaking at #26 in the UK and #35 in Australia. Despite this, it reached the top spot in Denmark. Although not expected at the time, "Around the World" would be Aqua's final UK single release.