another thing to add...when you listen to a note... your not searching for anything in that note. pitches never change. dont think it you listen alittle harder your gonna hear a new sound in the note your playing. the notes sound exactly the same as they always have sounded. so when you listen, dont TRY to hear anything, just listen. If you start looking for something or listening into a note. It's like trying to play hide and go seek blindfolded, the more you try to listen the more you are blinded of the vision of the pitch.

i understand if your trying this, you really wanna hear and understand it, but here's the secret the less you try to hear the more you will hear it. cause your ear needs to relax to hear these differences in pitch. so just relax.

another thing dont expect to be master of this the first time. and that your gonna get perfect pitch in full bloom right off the bat. there is no secret or shortcut to this. just like learning to play guitar, you weren't just told "put your fingers on the frets, and strum the strings", and a second later your were hendrix. it does take alot of patience and alittle bit of time.

so just relax and listen.

p.s. If you are having doubts on whether or not, your hearing the right thing?? If you are hearing anything that is different, you are hearing it right. See "perfect pitch" seems still so much more than it is. See the thing is, in everyday life we always looked past the simple things, and perfect pitch is simple. It's always been in your face, you just thought it was something more.