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The dominant uncertainty on the Standard Model prediction of
the muonic (g-2) stems from the leading order hadronic vacuum 
polarization. Vacuum polarization integrals involve the vector 
spectral functions which can be experimentally determined from 
two sources: (i) e+e- annihilation cross sections and (ii) 
hadronic tau decays. Recently results with comparable precision 
have become available from CMD-2 on one side, and ALEPH and CLEO 
on the other. The comparison of the respective spectral functions 
involves a correction from isospin-breaking effects. After correction
it is found that the dominant  pi+pi- spectral functions do not 
agree within experimental and theoretical uncertainties. 

The consequences of these discrepancies for the muon anomalous 
magnetic moment are discussed in this talk. New results on a(mu)[had]
obtained from an entirely revised analysis are presented.
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