Depends on your taste to be honest. Me, I think Giga-P, samfree, mafumafu, Neru and Kikuo are pretty good, though maybe you wouldn't like some of the songs. Kikuo can be really dark at times. Actually, let's make that a lot of times. Mitchie M is known for his realistic tuning of Miku, if that's what you want. read more
There are plenty more that you can find online, though I think I’ll keep this answer from getting longer than it already is. For more information on some of the mentioned producers, you can look at their article on the Vocaloid wiki. Or just, well, Google it. read more
Out of the more recent producers, there's at least BIGHEAD and tilt-six, both hugely popular (tilt-six started in 2013). And whether it's good or bad, I think that most people recognize Vocaloid from the characters. Miku is still going fairly strong, if you count all the upgrades. read more
I really think it's time to start hearing some of these artist songs more often then what I see people listening to. Sure it's nice to listen to the old artists but we are entering a new generation of vocaloid producers. read more
Depends on your taste to be honest. Me, I think Giga-P, samfree, mafumafu, Neru and Kikuo are pretty good, though maybe you wouldn’t like some of the songs. Kikuo can be really dark at times. Actually, let’s make that a lot of times. Mitchie M is known for his realistic tuning of Miku, if that’s what you want. read more