"Sad!" (stylized as "SAD!") is a song by American rapper XXXTentacion, and the lead single from his second album, ?. It was released on March 2, 2018. The track was produced by John Cunningham The song is XXXTentacion's highest charting in the United States, peaking at number seven on the Billboard Hot 100.

XXXTentacion began working with the producer for "Sad!", John Cunningham, in January 2018 after a preview of an acoustic song was uploaded to X's instagram page showing Cunningham playing the guitar whilst X sung. On January 11, 2018, X uploaded a gaming video to his YouTube channel showing him playing the popular video game, PlayerUnknown's Battlegrounds. The intro to the video was a preview for "Sad!" and X further previewed the song a month later in a video on February 4, 2018 after speculation the song was titled "Sad n Low" following a mass amount of snippets uploaded to YouTube. He went on to write in the description, "oh wait and one more thing! that song "sad n low" isn't the final version lol, nor is it even named sad n low... -.- " X went on to preview the song one more time in a YouTube video before its official release a few days later.

On March 1, 2018, X announced he was releasing two songs from his upcoming album ?, saying on Instagram "“Dropping two songs from my album tonight at 12:00 am est, play them more times than you can count.” "Sad!" was released on March 2, 2018 on Spotify, Deezer, iTunes/Apple Music and Tidal alongside "Changes".

HotNewHipHop compared "Sad!" to the singles on X's debut album, 17 due to its emo hip hop aesthetic, saying "Once again, the young Floridian is veering into emo territory — with a lo-fi synth string loop and crisp percussion, the melodic ballad showcases X's ear for melody." XXL noted how the "upbeat instrumental" varied from the lyrics that shown XXX "struggling with depression and suicide over an ex-lover."Rap-Up also pointed out the "emo-melodies" that surround the track and spoke on the theme of suicidal thoughts over an ill-fated romance.

"Sad!" was also received well among media personalities, especially Kylie Jenner who showcased the song on her Snapchat story, which generally leads to great exposure and promotion for singles.

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