The top 1 single can vary depending on the time period and location. The easiest way to find the current top single is to look it up on a music chart website. Here are some popular music chart websites:

• Billboard: https://www.billboard.com/charts/hot-100

• Official Charts (UK): https://www.officialcharts.com/charts/singles-chart/

• Rolling Stone: https://www.rollingstone.com/charts/songs/

These websites update their charts regularly and offer different ways to sort the top singles by genre, popularity, and region.