Baritone (older use) / 6 string bass (older use) such as the Fender Bass VI - E1 A1 D2 G2 B2 E3 (like a standard guitar but an octave lower, and often played like a standard guitar rather than a bass guitar.
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Guitarists who play mainly open chords in these three major-keys and their relative minor-keys (Am, Em, Bm) may prefer standard tuning over an M3 tuning.