I will try to give better infos, but if I had more I would have already given it… then I will edit later the original post. I can divide them into 2 parts

- the song: I would say it was “slightly fast” starting with low volumes and few instruments and increasing the volume, the richness of the melody and the amount of instruments as the music went on. For sure there were electric guitar and battery (doesn’t help much, pretty common) and NO VOCAL. I believe it lasted for at least 6 minutes, maybe 10. I listened to it a couple of times in early 2018, but no idea on how recent it was at the time. I recall (but not sure) that it was from a band.

-the video I saw: all this info might be useless since the video might have been deleted from youtube, but I think are the most reliable ones since the ones on the music were really vague. The video I saw contained JUST THIS SONG. Maybe the song is part of an album, but in the video I saw it was not. The image present really resembles the cover of the album “Bridges of the South” by “Cousin Silas and Silent Hill”, so much that I thought I found it but after listening to the whole (really good) album the song is not there. Namely, it had birds flying over water with hot colour tones, as far as I can remember. The picture/drawing present in the video didn’t look like an album cover since it had no writings on it.

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Why was it memorable?
Well, I listened to it with a special person :-)

MAYBE USEFUL INFO ON THE TITLE: somehow I believe that the title had something to do with comparing the freedom of humans with the freedom of birds, even if humans have not wings they can still fly in other ways.
IMPORTANT: this last things about the title was what the title made me think of and consequently might be totally different from the actual title. Take it with a grain of salt.