Avengers: Every Single Deleted Scene From Endgame & Infinity War
34. The Guardians Get Their Groove Back
A completed scene that ultimately never made the cut, this one takes place after the Guardians of the Galaxy failed to stop Thanos at Knowhere and lost Gamora in the process.
Arguing about Quill's choice of music - which is clearly just subtext for their frustration - he and Drax (or Mantis for that matter) never noticed the incoming messages from Nebula which revealed that Thanos was planning a trip to Titan.
A blatantly fun Guardians scene through and through, there is a solid argument for why it was cut (too funny at a serious time in a movie that already had plenty of humorous moments), but in retrospect, it probably would have been better to leave it in as, unlike the final product, it actually explains how Quill, Drax and Mantis knew to find Thanos on Titan - where they ultimately crossed paths with Spider-Man, Iron Man and Doctor Strange.
Oh well, at least we can watch it on the home video release.