Ok, I've recently have gotten very interested in singing, and have been reading up on it. I can hear a pitch and sing it a will, though about 97% of the time, I don't know what that note is... Soooooo, I've been looking into ear training systems, and was wondering if learning to sing and recognize various intervals, plus, knowing how to sing in key. Can anyone give me an estimate how much these systems usually go for?








Oh, and by the way, what specifies the timbre of a human voice? :p