Was an experimental jazz-style that made use of rock instrumentation, took its rhythmic and melodic patterns from rock and generally avoided vocals.

What i think is that it adds loudness for preachers/church choirs. it is also able to hold up a lot of weight without pillars. : )) idek tho

That a hard question ill get back to u for it

The technique was mural painting and he used either freshly laid or wet lined plaster. he also use water to merge it with the pigment and plaster creating a internal part of the wall