I play ukulele and can't read notes very well, so I play with tabs. Luckily, the arrangement am asking about is duplicated in standard notation as well.
This is a line from the Christmas carol "Angels we have heard on high", or "Hört, der Engel helle Lieder" in German, or "Les Anges Dans Nos Campagnes" in French. I noticed that the notes highlighted in this picture produce a distinct feeling that amounts to much more than just completing (part of the) chord.
Together with the melody itself it sounds like the song is going up and down at the same time, though if you look closely, it only goes down.
Is there a special name for what's happening here? I would also be very thankful for some examples of the same thing in other songs, as I find it really beautiful in a mathematical kind of way.
I guess I am looking for an answer that explains the feelings that the music creates, similar to "this kind of chord usually feels like suspension, this one like resolution". And explaining contrast between bass and melody notes is important to me.