Guitar Key Ring

吉他鑰匙扣是一個簡單的音樂重要的參考工具，吉他手。

Guitar Key Ring is a simple reference tool for beginner and intermediate guitarists that displays the notes and basic chords within a major or minor musical key. The simple and large layout allows it to be used during practise and writing sessions at a glance, and during jamming sessions with other musicians.