Jalima, your comment about hymns being known to us from school assemblies strikes a chord with me.
I'm a member of my church's choir, it's a beautiful old church on a hill in a small village, stunning location and very popular with wedding couples who aren't interested in the church service, just the setting alas!
Our organist asks which hymns they want and they are non-plussed, have simply no idea and during the service, the choir and older members of the congregation will be the only ones singing.
Sorry, hijacked the thread but perhaps allowed as it's sort of relevant! So many mentioned by others are favourites of mine too.