I just saw that the soundtrack download for BG2 only covers the SoA aspect, is there any chance to get the ToB ost as well ? Love the battle theme and all.

You might try posting on these threads:

http://www.gog.com/forum/general/gog_games_missing_content_broken_games_incomplete_version_variations_etc/page1
http://www.gog.com/forum/general/missing_soundtracks_and_where_to_get_them/page1

Edit: hmm, this thread suggests it used to be here...

http://www.gog.com/forum/baldurs_gate_series/tob_soundtrack

Edit: a bit more digging suggests that maybe it was never really here, and what GOG had was a mislabelled duplicate of the BG2 OST:

http://www.gog.com/forum/general/gog_games_missing_content_broken_games_incomplete_version_variations_etc/post79
http://www.gog.com/forum/baldurs_gate_series/bg2_soundtrack

The plot thickens...