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key a track with your ears and a keyboard or get a program like rapid evolution or mixmeister which will key for you. personally i don't recommend programs, because tracks can be in ambiguous keys or fit more than one key, and i feel that when you use your ear, you don't say a song is in Bm for instance, you say it's in MY B-minor, so the sound is personally linked to you and your way of hearing music and then when you play two of your b minors together chances are it is more your sound.
so the way i key by ear is to basically play scales against the track and then mix it with previously keyed tracks to test the determined key. the best way i have found to do this is using ableton live and a simple software synthesizer. you can set up ableton to use your computer keyboard as a note-input device if you have no piano keyboard, and use the free demo of ableton if you don't want to buy it.
basically load your tracks in and warp them. then play one, and listening to the track, play a note on the keyboard which matches the pitch of a prominent note of the track. from here, it helps if you know music theory. most tracks are going to be in natural minor scales. the pattern of notes in a natural minor scale is always "whole-half-whole-whole-half-whole-whole". there are 12 possible minor keys and scales. play another note now that matches another note following. now, by process of elimination you will be able to narrow it down to only 4 or 5 scales that share these 2 notes. play another note that's part of these 4 or 5 scales and you're down to 2 -3 possible scales. eventually you will find one that seems to fit.
now, the scale always starts on a note that we call the "tonic", that is the note whose tone is the namesake of that scale. the tonic of a c minor scale is "c". the tonic note in a lot of your typical music is usually a dominant tone in the track, like the major note of a bassline or a sustained sweeping pitch or the note to which a melody comes back repeatedly. when you play the scale against the track, start on the tonic then work up in the pattern i wrote earlier. you'll hear the notes 'fit' the composition, and those that won't should be relatively obviously dissonant, that is they stick out.
to test yourself, start playing in ableton one track, then mix another one in like you were deejaying. the two should musically complement eachother. tracks that are in keys whose tonics are a fourth apart or a fifth apart (eg, C to F, C to G, D to A, D to G) also will sound complementary...
hopefully this helps. bottom line is if you don't know and don't want to learn this basic music theory, then get a program do it for you and trust the stuff it spews out.
you can ID3 tag mp3s using some burning programs like Nero.
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