Watch the Drop 3 Voicings: online guitar lesson by Brad Carlton from Guitar Lab: The Golden Arp
The drop 3 Add 9 chord in root position is derived from the 3rd inversion close voicing. This structure can be fingered on the guitar in a number of different ways. It can be played within a four fret span by utilizing a string skip between the 3rd and 4th voices or it can reside on an adjacent 4 string group which requires a seven fret stretch on the 1st through 4th string voicing, and a five fret stretch for the remaining two adjacent 4 string fingerings. This voicing is an essential tool in your rhythm guitar vocabulary.