Smell is supposed to be the strongest memory trigger, but music is a close second. Hear the song and the summer comes back with it. Most journals ignore this entirely — the soundtrack of your life plays, ends, and is gone.
Retrography records it, three ways. If you use Spotify, your listening history flows in on its own. If you use anything else — Apple Music, YouTube, a record player and a scrobbler — Last.fm covers it: connect your account once and every scrobble lands in your archive. And for the music you didn't choose — the song in the café, on the radio, at someone's wedding — there's a built-in Shazam button. It listens for a few seconds, names the track, and saves it into your day with the time you heard it.
Music then shows up where it belongs: on the day itself. The day page has a music box you can flip between top tracks, top albums, and an hour-by-hour list. The vertical timeline goes further — songs sit next to the places you were and the photos you took, so you can see that a track played at 21:33, on the walk home. Album covers are fetched automatically.
It compounds. A year from now, “On This Day” shows you not just what you wrote and shot, but what was playing. Your history stays on your phone — Retrography reads your listening services; it never posts anything back.