There are times when singing a new song involves singing an old song. One of the things I like to do with the music in worship is to re-arrange hymns. It helps that people already know the melodies.
When confronted with new melodies and lyrics sometimes people find themselves so overwhelmed with not knowing either that they manage not let the words sink in as they are too concerned with trying to make sure they are keeping up with the strange new hymn they find themselves singing.
Also there are times when the new arrangement allows people to rediscover the lyrics that they have sung before but got lost in the familiarity of the way they have always sung it.
Perhaps sometime I will put together a better video production so that people can get a better feel of this. But for now I have decided to put on YouTube a two minute clip of a Charles Wesley hymn.