13th chords and it can be played in place of most 7th chords (also known as dominant chords, or dominant 7th chords).
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Blues typically follows a 12 bar pattern based around Dominant 7th Chords:
||: A7 | D7 | A7 | A7 | D7 | D7 | A7 | A7 | E7 | D7 | A7 | E7 :||
Mix up today's chord of the day with previous Blues guitar chords when you play through the 12 bar progression and tune in tomorrow for another guitar chord of the day.