As for the lyrics of the song and with just about every song, I do not know, the brain appears to have a very poor memory bank in that area.
So a few key words that resonate with me, stick and I then let my mind go and add other stories or thoughts, to go with it.
You might say, I write my own version of a song, lyrics, in the hear and now and just play them out on the key board, all by ear.
In other words, whatever thoughts come to mind, just play them to whatever tune you chose.
You just know in an instant, if you have used a wrong word or note lol.
Hence for me on that song, rivers of life come to mind and I also, long to here from someone close to me, that's gone, died.
LOL, the above might all sound strange, I don't know, all I know is, if I know a tune to a song, I can play it, otherwise I know zero about music
BK Rolland, one man band Key Board - magic, all the bells and whistles.
For whatever the reason as well, all songs have a direction for me, as in north, south etc, up, down and a time and place lol.
So, you could say that when playing, you going down memory lane to a time and place and events etc in your life.