By 1965 
Miles Davis had gone through a handful of stages, from the 
Birth of the Cool
 nonet's multihued orchestrations to the development of a hard-bop sound
 keeled on Davis's midregister wooziness and the band's driving backbone
 in the "first" great quintet (featuring John Coltrane), to the modal 
freedom of 
Kind of Blue. So when the solidly established Davis 
convened a new quintet, known as his "second" great one, and hired 
youngsters Wayne Shorter, Herbie Hancock, Ron Carter, and Tony Williams,
 it seemed a skewed move. 
 
These six CDs show just how creatively and 
intelligently skewed the move really was. The material here, which has 
also been reissued on expanded single CDs of the main full-length 
original LPs (E.S.P., Miles Smiles, Sorcerer, Nefertiti, Miles in the Sky),
 is immediately and unceasingly startling. Davis & Co. were quickly 
discarding their live performance practice of playing loads of standards
 and were further discarding traditional melodic structures for more 
rigorous harmonic exercises. Shorter in particular, at times the most 
prolific composer in the band, was advancing his tunes and his 
solos in equal proportion. The tunes are increasingly sharp-edged and, 
with Williams driving the band with a categorical balance of abandon and
 control, loopily energized. Miles blows with tighter and tighter 
control of his tone even while the band seems to be finding all kinds of
 expressive freedoms that easily elongate into lengthier studies. Toward
 the end of this box, you'll hear the seeds of the Miles that went on to
 unloose Bitches Brew. Even though the roots of the aggressively 
electric Miles are in these sessions, there are uncategorizable points 
of beauty strewn all over the tunes.
