define jazz.
i would hardly call the js1000 fit for playing jazz.
i'd suggest something more like an epi casino or heritage h 535.
actually, focusing more on the blues and jazz aspect, the heritage h535 would be perfect. it's normally not as expensive as a gibson es335 and it's twice the quality.
and it's more than qualified to rock out, too.
/ignore the shredders when talking blues or jazz.
okay...my post is done...goodbye.