Which of these musical elements is usually not altered for improvisation?

A  documentary film  is a nonfictional motion picture intended to document some aspect of reality, primarily for the purposes of instruction, education, or maintaining a historical record.example: farenheit 911

Im not sure but i know it is not b

Ibelieve so yes. the industry for electric guitars (such as gibson, fender, prs, epiphone,ect) has went down over the past few years so i feel things will come back up for the vintage style electric guitar (such as the gibson les paul, fender stratocaster/ telecaster, gibson sg, gibson flying v,) so i feel like they will be bringing more vintage style instruments to the stage-jaydoe

He showed real human suffering rather than symbolism.