[Retracted] The Timbre Relationship between Piano Performance Skills and Piano Combined with Opera Music Elements in the Context of the Internet of Things

Table 5

Tonality structure.

Theme	B
	D feather (9–10)	G palace (11–12)
Variation 1	D feather (25–26)	G palace (27–28)
Variation 2	D feather (41–42)	G palace (43–44)
Variation 3	D feather (57–58)	G palace (59–60)
Variation 4	D feather (73–74)	G palace (75–76)