I think maybe the reason you were disappointed the second time was that you'd really engaged with it so well the first time. If you had a recording of a favourite song and kept listening to that, you might find the same effect.

If the singer does their job well, they'll make you feel that this is the first time the song has ever been sung. Clearly, if you listen to them doing it the same way a few days later, this illusion is shattered, no matter how well they do it - but someone else listening will hear it as you first heard it and be just as thrilled.

On the other hand, sometimes a singer just gets tired and finds it difficult to put the same energy and emotion into a song every time, maybe that's what happened.

Marje