1) Ustad Rashid khan
2) pandit Jasraj
3) pandit Bhimsen joshi
4) malini rajurkar
5) kishori amonkar

also tell me the reasons and the favourite raga by your favourite singer

I know this is not what you are asking for. . . but I like Ravi Shakar and Hari Prasad Chaurasia. They don't really count though, do they. I should really have a listen more to this type of music. . . i think it's really beautiful. Hopefully someone else can give you what you're looking for. . . i just thought I'd add my 2 cents.