There is musical progression within a song, and progression of a song over time.
I offer to you today a mash-up of a song written many years ago. At first, we hear the original, demo version, played only by bass and guitar. Next, we hear a later version performed by the whole band, Then, we hear the current version, performed recently in an updated studio. You see how the sound changes and progresses.
I applaud those who write the compositions, perform them, and inspire others to improve on the art.