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Lesson Ultimate Plan

Dom7 Shell

Root + 3rd + ♭7

Prove it — just do the practice exercise.
C7 Shell Voicing
C
R
E
3
Bb
♭7
In the dominant shell, only the seventh changes:

Root
Major 3rd — same as Maj7
Minor 7th — one semitone lower than Maj7

Example: C7 Shell = C + E + Bb

Remember: The 3rd stays the same, only the 7th moves.