I think I would've still adored Summoning had I not discovered Magma. Both bands utilize drums and percussion expertly, and have a superb sense of rhythm. And while Magma are jazzy quasi-rock , they are far more energetic than Summoning and achieve a somewhat similar ritualistic atmosphere, only by using layered operatic vocals and chants uttered in a call- response fashion.
They do, mostly bass. Lots of horns,piano,percussion, lo-fi drums, and lush choirs. The occasionally hysterical female vocals tend to repulse people, which is why many find the music quite goofy. Basicaly, it's jazzy operatic rock from a drummer's perspective. I remember the first time I listened to them I was immediately intrigued. Their music has such lucid, intuitive flow.Do they use any guitars?