Best answer by djraveinpeace
Thanks for visiting the help forums :)
Its difficult to say exactly why the song was taken down but I would say, going from what you have stated above, that it was not uploaded by the original artist, it may well have been taken down for copyright violations. Soundcloud users can only upload material that they have either created themselves or have at least the relevant permission to do so.
That said though, the user may well have had permission to upload the track and it may just have been taken down because the user just chose to do so.....again, it is very difficult to say exactly.