Conductors help the musicians count and when to change volume. Also they help the musicians come in at the right time or to stop
John Constable was not a painter back then
The Scream is a work of remembered sensation rather than perceived reality. Munch’s approach to the experience of synesthesia, or the union of senses (for example the belief that one might taste a color or smell a musical note), results in the visual depiction of sound and emotion. As such, The Scream represents a key work for the Symbolist movement as well as an important inspiration for the Expressionist movement of the early twentieth century. Symbolist artists of diverse international backgrounds confronted questions regarding the nature of subjectivity and its visual depiction. As Munch himself put it succinctly in a notebook entry on subjective vision written in 1889, “It is not the chair which is to be painted but what the human being has felt in relation to it.” While such events and objects are visually plausible, the work’s effect on the viewer does not depend on one’s familiarity with a precise list of historical, naturalistic, or formal sources. Rather, Munch sought to express internal emotions through external forms and thereby provide a visual image for a universal human experience.
https://www.khanacademy.org/humanities/ap-art-history/later-europe-and-americas/modernity-ap/a/munch-the-scream
