#1
no i don't go deaf. I learned to figure out songs by ear a while ago, and it has been going on pretty good, I was able to learn three songs in a week, and then I took a break for two days, and when I tried to learn another song, it feels like I cannot figure it out. It was like I'm new to this thing is it just because I'm not in the mood or what?
#2
What song did you try to learn? What songs have you learned before? Some songs are harder to figure out by ear than others. I learn mostly by ear and I run into songs that give me a lot of trouble all the time.
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Theory: Not rules, just tools.

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*note that by fan i mean that guy who wants his friends to know he knows this totally obscure hip band that only he knows about with 236 views on youtube. lookin' at Kev here
#3
Sometimes that can happen when you consistently practice/train on something, even if the break was a small one. However, if you keep trying to train your ear after the "loss of ability", your foundation should become stronger as a result.