What mainstream jazz form relied heavily on arrangement?

Generally spontaneous human combustion is something that still bewilders some, human combustion happens very rarely and doesn't affect the surrounding areas, so unless you want to set your self on fire, human combustion will remain spontaneous and very rare.

Concerto grosso was composed during the classical era. (sorry if i misspelt the name)

Net  the suffix is your .com/.net/.org, and so on, i believe

Well i need to see the painting to be able to u.