The easiest way to describe this, since every track is different, is just to run them down. Cool, but not THAT different from what we already have. The Battle of Gall is great fun. An extended track, it basically tells of a massive air battle going on while, at the same time, a group tries to sneak into a complex. McNeely had a great freedom to choreograph the battle to his music, after a fashion, and did so.
Imperial City is impressive.
The Southern Underground and, later, Into the Sewers, don't do much for me. They're both short and kind of pointless. No big loss. It's like a tribal reworking of the Imperial March, with orchestral flourishes to accent Xizor's reptillian nature, and one of the best pieces on here. This really would be worthy of the movies.