This would make a major 7th chord. For a regular 7th chord, we need root, 3rd, 5th and b7 – but to say 'a flat 7' would be too easy to confuse with the chord A b7, a completely different thing.

You’ll notice each major 7 chord has its own ‘EQ’ due to the different strings used. I’ve highlighted A for particular attention here because it’s such a nice key on the guitar, but you ...