nominal key造句

Although the piece has the nominal key of B minor, Berg makes frequent use of chromaticism, whole-tone scales, and wandering key centers, giving the tonality a very unstable feel, which only resolves in the final few bars.
The introduction's theme is notable for its apparent formal independence from the rest of the movement and from the concerto as a whole, especially given its setting not in the work s nominal key of B-flat minor but rather in D-flat major, that key's relative major.
It's difficult to find nominal key in a sentence. 用nominal key造句挺难的