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Nirvana 的《Sappy Acoustic》原曲为 C# 调。 Originally recorded in the sounding key of C#, 'Sappy Acoustic' by Nirvana is best approached with a Capo placed on Fret 1, enabling guitarists to execute friendly C shapes while fully preserving the studio pitch. The song relies exclusively on open cowboy chords (Dbb5, Ab5, F#b5, G#b5, Bb5, Cb5), letting beginners concentrate on tone clarity, ringing string resonance, and sustain without encountering demanding barre finger fatigue. The primary progression challenge lies in switching between Dbb5 and Ab5: keep your fingers hovering close to the fretboard rather than flying off between changes. Set your metronome at an initial practice tempo of 79 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 110 BPM.