Only 91 songs have debuted at No. 1 in the history of the Billboard Hot 100 — here they all are

The Billboard Hot 100 is widely considered the definitive all-genre singles chart in the US.Although it was officially launched in 1958, Billboard began using modern airplay and sales data in 1991, allowing for more time-sensitive calculations and accurate rankings.Well over 1,000 songs have reached the coveted No. 1 spot, but it's far more difficult for a song to debut in the top position; it typically means a much-promoted single has met high expectations, or at least that an artist is supported and beloved by a legion of fans.Keep reading for a complete list of instant chart-toppers throughout history.

1. "You Are Not Alone" by Michael Jackson

"You Are Not Alone" was released in 1995.

Michael Jackson/YouTube

Michael Jackson was the first artist to achieve this feat with "You Are Not Alone," which debuted at No. 1 on the chart dated September 2, 1995.It was the second single from Jackson's ninth album, "HIStory: Past, Present and Future, Book I."