What makes Week! by Do As Infinity notable?

The single 'Week!' became a commercial success, reaching notable positions on Japanese music charts and contributing to Do As Infinity's reputation as a leading J-pop group. Its catchy hooks and vibrant sound resonated with fans, helping to define the pop landscape of the time. By the release of 'Week!', Do As Infinity was riding the wave of their initial success following their debut album in 1999. This single marked a significant moment in their career as it contributed to their growing popularity in the early 2000s, solidifying their place in the J-pop scene.