The six essential scales are: Blues Major Pentatonic Mixolydian Dorian Aeolian and Ionian From the six essential scales, you can get through a wide variety of traditional and contemporary music. A scale is simply a collection of pitches or notes, not really a "this is a Jazz scale", "this is a Blues" or "this is a Rock scale". It's how a scale is used that really matters not its name.

"Ab Major" (or the key of Ab) is a major scale based on Ab, with the pitches Ab Bb C D Eb F G. Its key signature has four flats: Bb Eb Ab Db. Its Relative Minor scale is F Minor. Its Parallel Minor is Ab Minor.

The primary chords for any major key are the I, IV and V chords of its corresponding major scale. For Ab Major, the primary chords are: Ab, Db, Eb and Eb7. From the primary and secondary chords of a major key, countless songs and chords progressions can be played.

The secondary chords for any major key are the II, III and VI chords of it's corresponding major scale. For Ab Major, the secondary chords are: Bbm, Cm and Fm. From the primary and secondary chords of a major key, countless songs and chords progressions can be played.

Wikipedia defines "Jazz" as a musical art form which originated at the beginning of the 20th century in African American communities in the Southern United States from a confluence of African and European music traditions. The style's West African pedigree is evident in its use of blue notes, improvisation, polyrhythms, syncopation, and the swung note.

After you mastering the six essentials scales below and start to explore more advanced styles of music, especially jazz. There are a few more scales that are needed to cover the broader harmonic palette that a typical jazz tune draws from.

The Ionian/Major scale is one of the six essential scales that every ukulele player should know. Here are the chords for all 15 Ionian/Major scales. From the Ionian/Major scale all other diatonic and pentatonic scales can be derived.