Also, in starting this thread I thought that by discussing the elements of songs which don't do it for us, we can also focus on the elements which do make a song great, in the opinion of each of us.

So as a counterpoint to my initial suggestion of a worst song, this is my suggestion for a beautiful, and brilliantly arranged song:

AU Abdel Gadir Salim - Bassama

For me it is one of those songs which stops me in my tracks. I love the melody, the singing, the instruments, the rhythm, the emotion, the way the music builds as the song progresses, and yet I have no idea what the lyrics are because it is in Arabic.