1. Is there Lyndon–Hochschild–Serre spectral sequence for not normal subgroup? 2. What can you say about it? Can you describe $E^{p, q}_1$ ? What is about $E^{p, q}_2$? 3. What is the best technique to get the spectral sequence? For me Grothendieck spectral sequence much better than spectral sequence of a filtered complex. I am equally interested in version for group cohomology and for Lie algebra cohomology. I already asked a version of this question but get no responses. http://math.stackexchange.com/questions/1112179/hochschild-serre-spectral-sequence-for-not-normal-subalgebra