To learn Nanamusica - Kanata chords, your first step should be understanding these chords - C, Em, D, Em, G, D, C and G in sequence. To master the tempo, it's wise to start at 90 BPM before aiming for the song's 180 BPM. With G Major as the song's key, tweak the capo to cater to your vocal pitch and chord likes.
