“ It's very wide sounding-- lots of different sounding instruments. The excitement I had making this record was the same excitement I had making the first System record."
—Serj Tankian

He played most of the instruments himself but did get help from System of a Down drummer John Dolmayan and Guns N' Roses drummer Bryan "Brain" Mantia, along with Dan Monti on guitar and bass, Ler LaLonde on guitar[1], opera singer Ani Maldjian and some string players, Antonio Pontarelli among them

from Wikipedia

Track Listing

Disc 1:

1. Empty Walls
2. The Unthinking Majority
3. Money
4. Feed Us
5. Saving Us
6. Sky Is Over
7. Baby )
8. Honking Antelope
9. Lie Lie Lie
10. Praise The Lord And Pass The Ammunition
11. Beethoven's C***
12. Elect The Dead