Patent ID: 7539941

Claim:
A performance data editing method for a computer system containing a display, comprising the steps of: controlling the computer system to display at least one layer in a window on a screen of the display; attaching an execution icon corresponding to execution-related data onto the layer, wherein the execution-related data constructs a part of performance data; allowing the execution icon of the layer to move in response to an operation of a user of the computer system; detecting an event in which the execution icon is moved; and upon detection of the even, when the execution icon is moved outside of the window, then deleting the execution-related data corresponding to the execution icon from the performance data and, when the execution icon is moved close to an end of the window, then controlling the computer to scroll the display of a portion of the window without deleting the execution-related data corresponding to the execution icon, wherein said attached execution icon represents execution-related data for adding a predetermined type of articulation to a musical tone to be generated based on the performance data, said predetermined type of articulation causes the musical tone to be generated in accordance with a specific technique, and wherein said step of attaching the execution icon causes the corresponding execution-related data to be incorporated into the performance data being edited.