De or het jazzbassist?

The correct Dutch article is:

de jazzbassist

Rule Words ending in -ist: almost always de. See the rule

How to use jazzbassist

the jazzbassistde jazzbassist
this jazzbassistdeze jazzbassist
that jazzbassistdie jazzbassist
our jazzbassistonze jazzbassist
your jazzbassistjouw jazzbassist
every jazzbassistelke jazzbassist
which jazzbassist?welke jazzbassist?
a big jazzbassist / the big jazzbassisteen grote jazzbassist, de grote jazzbassist