Black Out Days (Future Islands Remix) - phantogram - SoundCloud
Depending on which version you heard, you might be looking for: Black Out Days - Future Islands Remix - Spotify Download Black Out Days Remix MP3 – MuzicaHot
Apple Music and Amazon Music include this remix in their libraries. Popular Remix Variants Black Out Days (Future Islands Remix) - phantogram
Qobuz : Individual tracks available for purchase, starting around $1.99. Download Black Out Days Remix MP3 – MuzicaHot
This response uses data provided by Google's Knowledge Graph phantogram - SoundCloud