11.10The dominant is the most flexible chord
The V7 chord carries tension, so it accepts many altered or extended notes.
Instead of plain G7:
G B D F
you may eventually play:
- G9
- G13
- G7♭9
- G7♯9
- G7♭13
- altered dominant sounds
But the function remains:
G dominant wants C
So always understand the function before worrying about the color.