8

Okay, let's see if you figured it out correctly. Below are the three different chord progressions found in the song, as well as the chorus with the error.

Harp Solo (12)
I I I I
IV IV I I
V7 IV I V7

Verses (8)
I I7 IV IV
I V7 I V7

Bridge (8)
IV I IV I
IV I V V

Chart
Harp Solo (12) | Verse (8) x2 | Harp Solo (12) | Bridge (8) | Verse (7.5) | Verse (8) ||

See if you can figure out where the two beats were dropped in the verse following the bridge and how you could approach the vocals to change this to be a standard 8 bars.

This song is on the School of the Blues House Band Standards List simply because of its form. There is no standard 8 bar blues chord progression, unlike the 12 bar blues which is expected to be a specific way (with small variations every now and again). In my experience "Key to the Highway" provides the most common version of an 8 bar blues used. If you use this as your reference point, when doing a different 8 bar blues you can say to yourself, "It's like Key to the Highway, but it changes like this..."

The chord progression is...

I V IV IV
I V I V continue reading...