What Went Down is the fourth studio album by British rock band Foals, released on 28 August 2015 via Transgressive Records in the United Kingdom. The album is produced by James Ford, known for his work with Simian Mobile Disco, The Last Shadow Puppets and Arctic Monkeys amongst others. According to frontman Yannis Philippakis, it is slated to be their loudest and heaviest record to date. What Went Down debuted at #3 on the UK Albums Chart and at #58 on the Billboard 200, making it their highest charting album in the United States to date. With the departure of bassist Walter Gervers on 05 January 2018, this album marked the last album to feature him on bass.