How to Mix Music: Audio Panning and Lateralization

Record producers and recording engineers, if they know what they’re doing, take into account brain lateralization in producing a mix:

Rhythm-heavy tracks sound more natural if panned a little to the right speaker (right ear; left brain hemisphere).
Harmony-rich tracks sound better if panned a little to the left speaker (left ear; right brain hemisphere).
Tracks requiring both melodic and rhythmic processing, such as lead vocals (including rapping, which has a lot of melodic content), sound better in the middle.
If lyric intelligibility is a problem, right-speaker bias may help, as the right ear is connected to the speech- and sequence-processing left hemisphere.