Nostalgia, the fleeting nature of romance, and the "disappearing like fog" metaphor common in the genre.
These are high-dimensional numerical representations of data (like audio or images) automatically extracted by layers of a neural network. andre_zniklas_jak_mgla_nowosc_2017
If you are asking from a (e.g., "how do I extract deep features from this audio file using AI?"), this would involve using a Deep Neural Network to analyze the song. Nostalgia, the fleeting nature of romance, and the