[3](Tovey) a group of themes within a section of form that are united by virtue of being in the same key.

The level at which each concept is most often introduced is indicated by the numbers 0-4 in brackets, where 0 is pre-college level, 1-4 are various levels of undergraduate theory, and 5 is graduate level. Names of the originators of recent terms, when known, are indicated in parentheses.

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[3] music which has no associations outside itself; it has no text, and does not attempt to narrate a story, portray characters, events, impressions, etc.; e.g., Bach's fugues.