Which band was not part of the American blues revival?

Unlike the other musical properties, distinctions in timbre are not measurable by ____________, but by the shapes and frequencies of the _______________ produced by a voice or instrument

A) the performer; audience response B) traditional standards; high sounds C) listening; visual effect D) degree; sound waves E) the human ear; robots

What should you do to the mounting head when leaving the camera unattended?

A) tighten the pan and tilt drags B) tighten the pan and tilt locks C) loosen the pan drag but tighten the tilt drag D) loosen the pan and tilt locks E) separate the camera from the quick-release plate