Well , my guess is that it is the intro to a song . The letters a, e, f, etc represent chords, and the numbers are some form of beat or the timing of the music. Which song,,,I do not know.
Discussion
That number was turned into a song by #Annonymal, but primarily is something else... But thanks for trying to figure it out!
If I could guess again then, its the number of the very first Bitcoin block ever mined by Satoshi?