
an interesting concept here
Depends, forever is a long time. Do we have to listen to the song constantly until the end of forever? or can we choose when to listen to it? Can we listen to other artists when we are not listening to the song? It really depends, if the answers are: yes, no, no than I would not like to listen to ANY song for that long.
However, if it one song that we can choose to listen to at anytime, and will not be forced to listen to it constantly until eternity ends- Sing for the Moment would be my choice. But, that all depends on the rules. It also depends on the possibility of life after death. (Not that I believe in an afterlife) But hypothetically if there is, do we need to listen to it then as well? Or if we had a choice in the world of the living do we still get a choice of when we wish to listen? Can I still listen to other artists in this hypothetical afterlife? It all depends on the rules, that's really all it comes down to.
Sing for the Moment if the conditions are right.