How to practice Crazeology with play-along tracks?

Use the play-along backing track above to practice Crazeology in the key of D. Listen to the audio with bass, piano, and drums, start by playing the melody, then practice improvisation and soloing over the chord changes.

What scales to use for soloing over Crazeology?

For soloing over Crazeology, recommended scales include: bebop, bebop major. Use arpeggio patterns over each chord to create melodic lines that follow the harmony of this jazz tune.

Who composed Crazeology?

Crazeology was composed by Bennie Harris in 1944. It is a swing standard in 2/2 time. The original key is Bb; this page shows it transposed to D.

What key is Crazeology in?

The original key of Crazeology is Bb. The form is AB with 24 bars. This page shows the chart transposed to D.

What scales work for improvising over Crazeology?

Recommended scales for Crazeology in D: bebop, bebop major. Scales and arpeggios update in real-time as each chord plays, with context-aware analysis (e.g., Phrygian Dominant over secondary dominants).

How does the interactive backing track work?

The backing track plays with realistic walking bass, drum patterns, and voice-led chord voicings. Scales and arpeggios update in real-time as each chord plays. You can limit the fretboard zone for close-proximity voicings, toggle a reference melody, loop any section, and choose between multiple sound presets. Works for guitar, piano, bass, ukulele, and 7 more instruments.

Can I edit the chord chart?

Yes. You can modify the structure, chords, and arrangement of any standard to match your preferred version or create your own reharmonization.

Crazeology in D

Bennie Harris(1944)swing

Do Re MiC D E

Section A

♬

Section B

♬

A13♬

♬

BPM: 120

Chord Diagrams — Crazeology in D (Guitar)

Display

FingerNoteDegree

Chord Voicings Closest Voicing

A13

Crazeology 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 E (ascending whole step), E to A (ascending perfect fourth), A to C (ascending minor third), C to F (ascending perfect fourth), F to A# (ascending perfect fourth), A# to A (descending half step), A to F# (descending minor third), F# to B (ascending perfect fourth), B to E (ascending perfect fourth), E to E (ascending unison), E to A (ascending perfect fourth). A half-step bass movement creates a strong leading-tone pull that demands resolution. The root motion by larger intervals (fourths and fifths) gives each chord change a strong, decisive character. When the progression loops, the bass returns from A to D by perfect fourth.

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. Over dominant seventh chords, D Mixolydian adds the flat seventh for an authentic blues-rock edge.

swing2/2 · 24 bars · Form: AB

Chords: D, Em7, A7, Cm7, F7, A♯6, A7♭5, F♯7, B7, E7, Em, A13.

Scales for Improvisation D bebop, D bebop major.

Diatonic chords: See all chords in the key of D