Hmm.
For the record, back in the 70's Led Zep were considered progressive rock (think about it.. they're song structures were and are still pretty revolutionary). However, many people think that they are a rock and roll band due to the fact that they have a song called 'rock and roll'. :roll:
I would personally deem Led Zep to be a blues-based, progressive classic rock band even though they are no longer together to progress anywhere.
They're pretty hard to pin down.. what with all their acoustic-folkey songs, occassional funk excursions and a penchant for theatrical rock 'events' such as Kashmir, Stairway to Heaven and When The Levee Breaks.
And as for Jazz guitarist.. Django Reinhardt.