 When vibrato is required at the first or second fret it is sometimes beneficial to push the string across its axis as it produces a more noticeable vibrato sound there.This second method will only vary the pitch by raising it sharper than the starting note, but is the most common method of vibrato used by steel-string and electric guitar players, lacking the precise tonal qualities of nylon strings.Natural harmonics can be played by touching a left hand finger upon specific points along an open string without pressing it down, then playing the note with the right hand.