Over Shabbos, I was eating lunch with a neighbor, and he brought up an interesting observation after we concluded a zemer (song). Amongst non-Jews, you don’t hear people breaking out in song, and singing together as one. Sure, people will sing songs to themselves, either quietly or out loud. But have you ever heard more than one person getting together with another and singing it together in its entirety? The only exception I can think of is religious functions like church and/or Christmas carols.
But Jews very frequently join together in song. Whether at the Shabbos table, at a wedding, mesiba, oneg shabbos, or other type of simcha, Jews get together and sing together in unison. It creates a spiritual bonding that uplifts the soul. I think it is very special and should be treasured.