It is not to be confused with Price elasticity of supply. Price elasticity of demand (PED or Ed) is a measure used in economics to show the responsiveness, or elasticity, of the quantity demanded of a good or service to a change in its price, ceteris paribus.
Resolution in western tonal music theory is the move of a note or chord from dissonance (an unstable sound) to a consonance (a more final or stable sounding one).
Source music. Source music refers to music in a drama (e.g., film or video game) that is part of the fictional setting and so, presumably, is heard by the characters. It cannot be background music (e.g., from a radio or TV), but can be produced by characters themselves as part of the plot.