Here, and provide a selection of 336 of the most popular chord types in all twelve keys, together with a selection of useful moveable chords and comprehensive sections on chord theory and tuning. The chord window diagrams are child-friendly with a little initial help from an adult. Chord theory and tuning sections are also provided to give a parent, teacher or carer a little help along the way on their musical journey. (using the key of C as an example): C, Cm, C7, Cm7, C5, C6, Cm6, Cmaj7, Cdim, Cdim7, C+, Csus2, Csus4, Cadd9, Cmadd9, Cm7-5, C7sus4, Cm(maj7), C7-5, C7+5, C7-9, C7+9, C-5, C9, Cm9, Cmaj9, C11, C13. -336 chords in all 12 keys -large child-friends chord window diagrams -Standard GDAE mandolin tuning -Comprehensive chord theory section -Fingerboard diagram -Tuning diagram with instruction -20 moveable chord diagrams -240 moveable chord positions -Alternative chord naming chart