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Old 20th February 2020
Most guitarists learn the harmonic relationships by fingering patterns which allows instant transposing between keys based on starting position on the fingerboard.

Unlike, for example, the piano, the fingering patterns and relationships are the same for all keys except in open position.

Also, most guitarists think in terms of chord numbers, not the more confusing solfaggio.

I,ii, iii, IV, V,vi,vii dim,I. (vii dim is often notated as vii- or vii with a superscript zero.) Also the seven chord is often played as a major flatted seven chord in rock and much other popular music. (Bb in the key of C.)