Shadowhunters music supervisor, Lindsay Wolfington, announced on Twitter that the original theme song composed for the show by Ruelle will debut on the second episode, The Descent Into Hell Is Easy.
The episode is already on Freeform App, and if you’re in the US, you can watch it here.
UPDATE: Check out the intro video of the show featuring the song, This is the Hunt:
UPDATE 2: The full song is now officially available.
UPDATE 3: Season two of the show has a new intro featuring the same song. Watch it here.