This is definitely "Relativity" at the start of this video. However, if you look/listen at about 4:27 onwards there seems to be another new song unless it is the end of "Relativity" (but I doubt it, it sounds completely different).
Anyway, have a listen and see what you think but it sounds amazing. One of The Scream's more gentle, spaced-out softer moments that we all know and love. Lovely use of the melodica too which we've not heard since Augustus Pablo contributed to "Star."http://www.youtube.com/watch?v=Rj6Pz5UU8EU