Bars, time and bars (if you want)
Show formal sections (verse, chorus, bridge, etc.)
As an example, see Figure 3.1-2: Flanging Effects in Miss Toni Fisher's "The Big Hurt" (1959). Just ignore the layer named "Flanging". Note the time line, the division of bars, the sections (here, A1, A2, etc. refer to verses, while B1, B2, etc., refer to choruses).
(a) Choose one from the Following Sound Sources
(i) Voices
(ii) Guitars
(iii) Keyboards
(b) Graph of Technological Parameters
(c) Try to describe their Sound Quality (Timbre) in your own words (from section to section)