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Crazy (Gnarls Barkley) in D
Key of D
D major is one of guitar's most resonant keys. The open D string acts as a droning root, and the open A string provides the fifth. This gives D-based strumming a wide, ringing quality that flatpicks and fingerpicks love. D is a beginner-level key on guitar because the open D and A strings provide a powerful bass foundation, and the open high E is the 2nd scale degree adding brightness. Beginners will find this key approachable since most chords use open voicings with minimal stretching.
Voice Leading
The bass line moves through D to F (ascending minor third), F to F (ascending unison), F to A# (ascending perfect fourth), A# to A# (ascending unison), A# to A (descending half step), A to A (ascending unison), A to D (ascending perfect fourth). A half-step bass movement creates a strong leading-tone pull that demands resolution. The predominantly stepwise bass motion creates smooth, connected voice leading. When the progression loops, the bass returns from D to D by unison.
Scales for Improvisation
D major pentatonic works because every note is either a chord tone or a safe passing tone — there are no avoid notes. For soloing, this means you can play freely without clashing. Try the major blues scale — adding the flat 3rd as a passing chromatic note gives bends and slides an expressive, soulful quality.