If you're looking for non 4/4 music, the whole of prog metal is basically open to you. Animals as Leaders, Intervals, Plini, Polyphia etc are all instrumental.

If you're looking for non 4/4 music, the whole of prog metal is basically open to you. Animals as Leaders, Intervals, Plini, Polyphia etc are all instrumental. Periphery, Monuments, Tesseract, Dream Theater, Volumes, Born of Osiris, Jason Richardson, The Contortionist etc span a wide variety of sounds, and all implement unique time signatures.