25.1The basic 12-bar blues
In C:
I7 = C7
IV7 = F7
V7 = G7
The basic form:
| C7 | C7 | C7 | C7 | | F7 | F7 | C7 | C7 | | G7 | F7 | C7 | G7 |
That last G7 is a turnaround leading back to the beginning.
25.1 The basic 12-bar blues
In C:
I7 = C7
IV7 = F7
V7 = G7
The basic form:
| C7 | C7 | C7 | C7 | | F7 | F7 | C7 | C7 | | G7 | F7 | C7 | G7 |
That last G7 is a turnaround leading back to the beginning.