1. Apparatus to find and act-upon a composition containing a sound component, the apparatus comprising: one or more of electronic-circuitry or processor(s) that: obtain or provide, an ordering of sound-segments; wherein said sound-segments are arranged in two or more dimensions; wherein two or more different sound-segments are associated with each composition in said ordering; wherein at least one of said two or more different sound-segments associated with each composition, includes a portion of its associated composition, which is more recognizable to user(s) than a beginning part of its associated composition; obtain or provide, a current-location in said ordering that refers to one of said sound-segments in said ordering; change the current-location in said ordering, in response to each user navigation action; play the sound-segment that is associated with the current-location in said ordering, in response to each change to the current-location; in response to a command-action by the user: play, add, move, remove, cut, copy, paste, arrange, organize, and/or order, the composition that is associated with the sound-segment at the current-location.