Although I love this soundtrack, the main theme and it's derivatives (Deionarra's theme, Transcendent One's theme, "Fortress of Regrets") are completely ripped off from Mark Mancina's "Speed".
Check Mancina's: "Main Title", "The Rescue" and "End Title" - it's totally Planescape... :)
That's not a rip-off. It sounds indeed very similiar, because it uses similar progressions and it's in the same key, but the whole melody line is different and evolves differently... could be an (un)concious inspiration, but not a rip-off :)
Nah, I am not gonna go for discussion about how many notes should be different in your composition, so you could not be sued or sentenced for plagiarism.
In age of remixes it doesn't matter anyway, but nevertheless we should acknowledge true, original artists.
I'm just stating the melodies are not THAT similar, so it could even not be a concious Morgan's decision, just an unconscious inspiration (or maybe just an accident, because both guys had the same basis - e.g. a classical composer). The world of soundtracks is full of "similarly sounding" cues and very often it's just an unconconscious inspiration, because melodies are somehow ringing in the background of our heads... :)