Primary Music Theory
   Arranged chords
   Triads
Arranged triads with the bass on the E string, triads of the first superposition
     Diatonic seventh chords with the bass on the E string.
      Arranged seventh chords in the first superposition

  Diatonic seventh chords with the bass on the A string, arranged seventh chords of the second superposition
Diatonic seventh chords with the bass on the A string, arranged seventh chords of the second superposition

 
 
  Chords are usually used in the separated form on the bass, in correspondence with a style of performed music. As a bass isn't a one-voice instrument, it is quite possible (during a solo or if an arrangement requires it) to use triads and seventh chords, performing all sounds simultaneously, similar to guitarists. The reason for a rare usage of chords in the harmonic way on the bass is the thickness of strings. The thicker the string is, the easier it is to elicit flageolets, and flageolets are actually overtones. In other words, the thicker the string is, the louder are overtones, hidden behind the main tone. When we perform four sounds simultaneously on a bass, all these notes with their overtones blend with each other and so fully overlap the frequency range, that there is nothing for it but to shout such an accompaniment down. So, to improve this situation, arranged chords are used. The main point of this chord arrangement is that besides doubling notes and octave repetitions, you can also miss degrees, which don't affect the harmonic function of a chord; those are the I (first) and the V (fifth) degrees. As a result we get stated below shapes of arranged chords.

Previous pictures show major and minor triads on a bass. Here the same triads are presented but in the arranged form. During the arrangement of these triads were removed: the repeated one octave higher I first degree, the V fifth degree. So, we see that arranged triads consist of two notes on a bass.
As exercises here are suggested diatonic sequences of arranged triads in major and parallel minor keys.
Having added the seventh degree to the arranged triad, we get fingerings of arranged seventh chords. As we already know, four kinds of seventh chords are built on the diatonic degrees. Those are: a major seventh chord Xmaj7, a minor seventh chord Xm7, a major minor seventh chord X7 and a half-diminished seventh chord Xm7-5. Shapes of these chords are presented below.
As exercises for mastering presented shapes, here are also suggested diatonic sequences of seventh chords in major and parallel minor keys.
On the four string bass we have two levels of basic triad and seventh chord shapes. Here is the second level of basic fingerings from the A string.
As exercises here are also suggested diatonic sequences of triads in major and parallel minor keys.
And at last, here is the second level of basic diatonic seventh chord shapes, built on the A string.
Here is the diatonic sequence of seventh chords built on the A string in the major and parallel minor keys.
   Major triad in the first superposition
   Minor triad in the first superposition

  Arranged major triad of the first superposition
   Arranged minor triad of the first superposition
   Diatonic sequence of arranged triads in the first superposition in the major key
  Diatonic sequence of arranged triads in the first superposition in the minor key
   Major triad with the bass on the A string
  Minor triad with the bass on the A string
  Diatonic sequence of triads in the second superposition, in the major key
Diatonic sequence of triads in the second superposition, in the minor key
Major seventh chord
  Minor seventh chord 
Dominant seventh chord 
Half-diminished seventh chord
  Diatonic sequence of arranged seventh chords of the second superposition in the major key
  Diatonic sequence of arranged seventh chords of the second superposition in the minor key

Major seventh chord
Minor seventh chord
Dominant seventh chord
Half-diminished seventh chord
  Diatonic sequence of arranged seventh chords of the second superposition in the major key
  Diatonic sequence of arranged seventh chords of the second superposition in the minor key
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