This is the song that not only introduced keef to the hip hop world but introduced Drill music (a new sub-genre to alot of people) to the mainstream. This song brought Chicago city to the forefront and put a magnifying glass on what would be regarded as "Chi-Raq"
Keef's breakout song paved a way for many people such as:
Katie Got Bandz ugly ass
The song was so impactful that Kanye came and really took it to new heights after jumping on the remix with his artists and Jadakiss
Thats why this song is a classic. Because of the impact it had on the genre.