THE MUSICAL SCALES OF THE THRUSHES. 
but again makes no attempt to use it in full as the Hermit 
does, witness his scales 4 and 5 in this notation: 
aoe of the Wood Thrush a 
2° 
i? Sam Sa ar 
ienese Di) ae eee 
aa 0 
Triad; major, minor. Dimd seventh. PenQtante. «osetia 
The Wood Thrush is generally content to render variations 
upon the components of the triad and the diminished 
seventh; beyond these it is apparent he is unable to progress. 
But the Olive-back, like the Hermit, has advanced to a 
more extended musical form and works that to its limit. 
Here is a progressive harmonic setting of his primitive 
scale which is confined to minor thirds—or something 
wonderfully like them—within the limit of the diminished 
seventh: 
Ist.Key of C Qnd DP 3rd.D 
If one begins at any point on the piano keyboard and 
progresses upward skipping two keys and striking the 
third, of course counting in the ebonies, one will eventuate 
upon one of the three forms recorded above; there are only 
three, no more. This is another primitive scale at which 
both man and bird arrived during some period in the 
development of their musical faculties. Whatever the 
Olive-back may sing which is not in strict accordance with 
this scale is sure to be merely a modification of it. 
As for the Veery, although one must translate his music 
into the chromatic scale, he does not really follow but 
sprawls over it with a weird harmonic charm heedless of all 
musical intervals. His tones are so slurred and mixed 
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