| Harmonics are a function of the physics of string vibration.
When you pluck a string, it vibrates in different modes. The
string moves back and forth as a whole. It also moves as a
sine wave with a node in the middle. It can vibrate as a double
sine wave with three nodes. Each node is the area where the
harmonic can be produced.
An open bass note, say open E, vibrating in this different
modes all at once is said to have 'harmonic content'. The
extent of the higher order content with relationship to the
primary note produces tonality.
By plucking at the node, it is possible to emphasize certain
higher order harmonics by forcing the string to vibrate primarily
in one mode.
If you pluck the E while running your first finger down the string
from the 14th fret towards the nut slowly you will very noticeable
harmonics appear at the 12th, 7th, 5th and 4th frets right at
the fret line.
Plucking the string right at the fret line in these positions and
then immediately releasing the finger from your left hand off
the string will give you a strong harmonic sound. This position
is the same for all open notes.
More advanced players force harmonics on fretted notes
by similarly dividing the string length into the appropriate lengths
and plucking the resultant nodes. Any primary tone and its
overtones are similarly mathematically related.
Hope that helps.
__________________ Hardly Ever Sarcastic Moderator of
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Last edited by Thor : 04-01-2009 at 01:06 PM.
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