根音--（大三）--三音--（小三）--五音--(大三度)--七音【大三和弦+大三度】
大七和弦琶音
7th chord
used in jazz
三和弦+7th
3rd and 7th could be natural, sharp or flat, and hence we have major 7th chord, dominent(忘了拼法？) and minor
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