eki-melo
With night falling, some exploration in Tōkyō Station 東京駅, with the murmur of moving bodies and the bright chimes of train departures.
When a train is about to pull away its platform plays a song, often unique to the line and direction. They cut through the background noise or spill in, indistinctly, from far away. These cheery tunes are known as eki-melo 駅メロディ (station melodies) or hassha-melo 発車メロディ (departure melodies) and soon become familiar, to the point of expectation, like the next track in a playlist.