You can go to the official website of Billboard to check it, or you can go to other music websites. For example, Meile.com has Billboard’s music list, which will be updated every week. You can check the ranking changes of songs on Billboard. See the trend of the song.

"Billboard" is an American music magazine founded in 1894. At that time, it was called "Billboard Bulletin". The content includes introductions and rankings of many music types. The most important rankings are the Billboard Hot 100 (single ranking) and the Billboard Album Chart (album ranking).