“All We Know” is a song by American DJ duo The Chainsmokers. It features vocals from Andrew Taggart (one half of The Chainsmokers) and American singer Phoebe Ryan. The song was released on September 29, 2016, by Disruptor Records and Columbia Records. The song is written in the key of C major with a common time tempo of 90 beats per minute with a chord progression of C – Fsus2 – Am. The vocals span from G3 to A4 in the song. The lyrics were written by Taggart and Swedish songwriting duo Shy — made up of Sara Hjellström and Nirob Islam (aka Shy Martin and Shy Nodi, respectively) — while the production was handled by The Chainsmokers.