The habit of comparing two versions of a song
Launch library · evergreen read

Listening to a cover version alongside its original recording highlights choices that might otherwise pass entirely unnoticed, since differences in arrangement or vocal approach become considerably clearer through fairly direct, side by side comparison of the two, a comparison that reveals just how many decisions go into even a familiar recording.
This particular practice sharpens a listener's ear for interpretation more generally, revealing how much a single song can genuinely change in feeling while its underlying melody and lyrics remain essentially the same throughout both separate versions, a consistency that makes the differences between them all the more revealing to notice.
Over time, this comparative habit builds a considerably broader appreciation for the many creative choices, whether tempo, instrumentation or vocal delivery, that shape how any given performance of a song ultimately comes across to a listener, choices a single version alone would never really give a listener the chance to compare.