You guys know. Sometimes songs, though they were short and repeative carries unspeakable and deep stories within.
There's this song I really like and it talks about such incredible story. So, if I turned it into a novel, will it classified as fanfic, or original novel?
If it's only inspired by the song and not taken from a song, it is fine. How to know? If you recount every line of the lyrics as a story, that could be considered plagiarism, though this is dependent on the judge if the copyright owner brings it to court. If you put the whole lyrics in your book without permission, that could be copyright infringement.
To be safe, just include a couple of lines where appropriate and do it sparingly, something like:
My fingers feel the strings of the guitar. The song that I used to play on this guitar suddenly comes back to me and so the strummer glides across the chords, "The moon is dark and the night is warm. But dear where could you be?" The lyrics came like a river. The song we used to sing, the melodies I used to play. I guess you never forget a happy moment after all.
You see, for songs to be considered copyright infringement or plagiarism, there must be a minimum amount of words or a duration of arrangement copied that can be recognized as same or similar enough. If you do not reach this minimum, you are safe and your quoting of the song is considered a homage.