i ve got a dark alley and a bad idea you should keep your mouth shut

Dorian, Phrygian, Lydian and other modes with characteristic tones

Triad and seventh chord arpeggios — 25 types with positions

Enharmonic chords: C# = Db, D# = Eb, F# = Gb — same pitch, different spelling

Tuning catalog for guitar, ukulele, banjo and bass — standard and alternate