What your refering to is crossfade playback. It is located in your preferences. Check the playback settings. The further towards 12 you set it the more it mixes to the next song. Remember the feature is NOT avaliable on the iPod. Just the computer

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"What you hear in a great jazz band is the sound of democracy. “The jazz band works best when participation is shaped by intelligent communication.”
Harmony happens whenever different parts get to form a whole by means of congruity, concord, symetry, consistency, conformity, correspondence, agreement, accord, unity, consonance…….