thay are just a great band in their own right
imagine a rock without led zeppelin or pink floyd
there won't be dream theater
because dream theater is led zeppelin heaviness+pink floyd experimental ideas=dream theater and progressive metal band
just imagine a world without pink floyd deep purple led zeppelin black sabbath trapeze scorpions ACDC thin lizzy together in the era from 1969 till the 80s
it would be a different world by then
so pink floyd are just creative as zeppelin but in another direction
and don't forget that jimmy page was a syd barret fan
peace