From the homepage of the band:
"Finish cello-rockers "Apocalyptica" have returned to the studio to record the first single of their forthcoming album (due early February 2005). The song, entitled "Bittersweet", is a dark ballad, that features fellow-countrymen Lauri Ylönen from "The Rasmus" and Ville Valo from "HIM" on vocals. The single, written by "Apocalyptica", Lauri and Ville together, will be released internationally on 29 November.
Eicca Toppinen, Paavo Lötjönen, and Perttu Kivilaakso will appear alongside Lauri and Ville in the video for "Bittersweet", shot in the band's hometown Helsinki and directed by renowned finish director Antti Jokinen.
Where in the beginning the classically-trained cellists established themselves with interpretations of Metallica, Slayer, and Sepultura classics, the band have developed their own writing skills for many years and matured while doing so. The new album will - just like its predecessors "Cult" and "Reflections" - again contain originally Apocalyptica-penned songs".

http://www.apocalyptica.com/

Band profile:

Apocalyptica