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Bruno Mars 的《Again》原曲为 G 调。 Arranged in the natural sounding key of G in standard guitar tuning without a capo, 'Again' by Bruno Mars utilizes direct fretboard shapes to project full open-string acoustic warmth and resonance throughout every section. To prevent hand fatigue on the challenging F barre chord, beginners can comfortably substitute an open Fmaj7 (xx3210) or small four-string F (xx3211) without sacrificing harmonic richness or vocal support. The primary progression challenge lies in switching between Em and B: keep your fingers hovering close to the fretboard rather than flying off between changes. Set your metronome at an initial practice tempo of 69 BPM in 4/4 time to master the '↓ - ↓ ↑ - ↑ ↓ ↑' strumming groove, emphasizing steady downstrokes on beats one and three before accelerating toward the studio speed of 96 BPM.