"Sentimental Days" is a piano song that captures an atmosphere of nostalgia, emotion, and sentimental memories. The piece immerses the listener in a mood where the past and memories come alive.

The harmonic structure of the song is both sensitive and nuanced, capturing the various facets of memories. Harmonic turns or chord changes are used to reflect the complexity and diversity of emotions associated with sentimental days.

"Sentimental Days" is a piano song that places emphasis on the past and the emotions connected to it. Through the piano playing, the intense emotions and moods of the past are revived. The song invites the listener to delve into the sentimental days, evoking memories and connecting with the emotions and experiences of the past. It creates an atmosphere of reflection and contemplation about bygone times, while also celebrating the beauty and depth of those memories.