I dunno about complimenting instruments...
But my favorite machine songs right now are all songs on Redeemer (cause it just
pwnz everything else so much), but if I had to pick from the old batch, something
that I feel is good because of the singing (I guess it's my "instrument"), I'd say
that Hubnester Inferno has some really nice vocals, imo, as well as kings,
attack music and also flagcarrier just cause it was so hard to sing so "nice" and I'm
kinda proud of it.
I'll leave the other members' answers to them. But if we look at the statistics, the
chance that Kahl or Jonne will answer this ain't that high.

Peace.