I'm not a jazz fan, but I do recognise that jazz recordings are generally brilliantly engineered with only a handful of acoustic instruments.
In particular, Gershwin's World by Herbie Hancock (24-192) is spectacular, both for vocals and instruments. The piano is the best I've experienced and will test the leading edges and dynamics of your mid-range like no other.
For bass slam, the new Perfume Genius album, Ugly Season (24-96), is quite something. It is also a little bright, so will expose a bright system ruthlessly. Try the tracks Pop Song, and for an immersive experience the stupendous Eye in the Wall.
For well recorded vocal: Always This Way by Laura Marling.