"Summer Days" is a song by Dutch producer Martin Garrix, featuring American rapper Macklemore and singer Patrick Stump of Fall Out Boy.

On 20 April 2019, Garrix, Macklemore and Stump all simultaneously shared a picture with the caption "I got this feeling on a Summer day" on their social media.

[5][6] The collaboration was officially confirmed by Garrix two days later.

[7][8] Garrix teased the release by posting a snippet of the song.

Kat Bein of Billboard described the collaboration as "a cross-genre-sing-along".