They contain carbon, hydrogen, oxygen and nitrogen and usually sulfur, occasionally phosphorus. Proteins form a large and essential part of the body mass, comprising especially cell membranes, connective tissue, muscles, enzymes, hormones, blood proteins. To maintain this mass the diet must contain a high proportion of protein, especially in growing animals and those recovering from debilitating diseases.
Russian composer Sergei Prokofiev wrote Peter and the Wolf in 1936 after returning to Moscow following a 19-year, self-imposed exile. It is a children's musical story that teaches about the orchestra by introducing various characters portrayed by seven themes played on either solo instruments or groups of instruments.
A famous poet and composer of songs, active in the early Middle Ages, was the philosopher Peter Abelard (1079â1142). Abelard's son Astrolabe had a prebend in the monastery of Benediktbeuern, so it is likely that the Carmina Burana began as the personal collection of his father's works.