sorry, i haven't been on much, but anyway, if you haven't found out yet (my bad sorry) well, a vocaloid is a program where you can make songs with someone's voice. Some people insert voices into the program to make sounds like ah, oo, ee, and stuff. There are 5 programs called Miku, Kaito, Rin and Len, Gakupo, and the newest one, Luka. Utaus are just vocaloids homemade vocaloids. You insert your own voice into it to make an Utau. Few of the more popular Utaus are Teto and Neru. (Man i sound like a nerd, but i learned all this from listening to my friend talk about it XDDD) It is pretty interesting though, if you know what your doing, which i don't... :D