Here's the .pdf, .mp3, and .sib (Sibelius 6) files for a transcription of the piano part to 'Pounding the Pavement' from 'Mombasa Streets' on the Halo 3: ODST soundtrack.

It's not 100% perfect, especially the chords in measures 6 and 28.

If anyone wants one, I could put together a percussion transcription.
As for the Alto part, it's essentially a solo over a concert Gb, I believe.

Enjoy, and let me know what you think!