A chord-only lead sheet shared from Guitar Scribble.
The standard 12-bar blues in A: four bars of A7, two of D7, two more of A7, then E7, D7 and a turnaround back to A7 with E7 in the last bar. The most played progression in guitar music, and the first one to learn for jamming.

12-Bar Blues in A, in the key of A in 4/4 at 100 bpm: 12 bars in 1 section (Blues in A), 3 different chords: A7, D7, E7. Style: Shuffle. Use ♭ and ♯ above the chart to move it to another key; every chord name follows, and Open a copy drops it into the chord progression maker to edit, print or export.
Tap a chord for its diagram, other voicings and the notes inside it. Diagrams are standard library shapes; the chart's author may play them differently.