One of the greatest things about the guitar is its capacity to emulate the melodic nuances and expressiveness of the human voice. Singers rarely simply hit pitches; there are often glissandos between notes, meaning ascending or descending movement from one note to the next.
For example, instead of singing a D followed by E, a singer will often seamlessly glide from D to E; the reverse is also common, gliding from E down to D. After landing on the targeted pitch, vibrato is then typically added, to sweeten the note.
