Back to the Beginning is a side mission in Marvel's Spider-Man: Miles Morales. It is only available after collecting all Sound Samples. Once players completed the mission, they will unlock the Purple Reign Suit.
Miles meets Aaron Davis to talk about memories with his father. He recounts a time where they went around New York and recorded different sounds to make a new sample. He tasks Miles to go around the city and record the sounds in order to recreate their mix. After finding all the sound samples, Miles goes to Aaron's hideout and sees a locker. The way to open the locker is to play the mix and opens up, earning Miles the Purple Reign Suit.