The D chord is a major triad, comprised of three notes: D, the root; F#, the third; and A, the 5th, as displayed in Example 1. As I have actually pointed out previously, lots of chord shapes include doubled notes. In Example 2, a standard open D chord, you’ll see that there are two Ds: the open D string as the most affordable note, in addition to the third fret of the B string.
Example 3 reveals a second-position D chord, based upon the open C shape, went up two worries. (” Second position” suggests the chord is constructed at the 2nd fret.) Here, D is still the lowest note, at the 5th fret of the A string. Going up to 5th position, in Example 4a we have the most common closed voicing of a D chord, with the most affordable D on the 5th fret of the A string.
Other typical variations on this shape are Example 4b, where you remove the high E string and play the within four strings, and Example 4c, using just the top three strings for a really intense voicing of a D chord.
Your last shape, Example 5a, is a barre chord in tenth position, with D as the most affordable note at the tenth fret of string 6. This specific voicing is frequently played with just the leading four strings, as displayed in Example 5b.
And now to put your D in context: Two popular tunes in which the chord features prominently are Led Zeppelin’s “Over the Hills and Far Away” and John Denver’s “Leaving on a Jet Aircraft.” That’s it for this installment on the D chord.