We probably all have a few that we know or hear and instantly have to identify to hear again.
I profess no musical prowess, so it's nothing technical that wows me, just the sheer pleasure of the sound
Some of those currently on my re-play list are
Piano Man, Billy Joel
Take me to Church, Hosier
Empire States of Mind Alicia Keys
Adagio for Strings, Barber
Suggestions for wider listening please?