On
bass guitar, slapping usually refers to a percussive playing technique most commonly used in
funk,
disco,
soul, R&B,
jazz,
country music,
rock, and many other genres. The style sounds much more
percussive than regular plucking of notes with the soft part of the plucking hands fingers, and is also usually louder (although on an electric instrument, the volume can be adjusted with the volume knob or through compression), brighter, and more distinct than the sound of a bass guitar played with the usual plucking or pick techniques. The slap sound comes from the combination of two elements: slapping, which involves striking the string with the side of the bony joint in the middle of the thumb, a harder surface than the pads of the fingers (used in plucked fingering); and intentionally allowing the vibrating string to come into contact with the metal
frets, producing a "toney" or buzzing sound that is normally avoided in plucked/fingered bass. In the slap technique, the bassist replaces the usual plucking motion of the index and middle fingers with "slaps" and "pops". In the slap, the bassist uses the thumb to strike the strings (usually the lower E and A strings) near the base of the bass's neck. In the pop, the bassist will use the index or middle finger of the plucking hand to snap the strings (usually the higher D and G strings) away from the
body of the bass, causing them to bounce off the fretboard; this produces a prominent buzzing tone with a sharp attack and more high-frequency vibrations than present in plucked bass. The bassist can play many notes quickly by rotating the forearm, alternately slapping and popping: during the pop, the hand moves away from the fretboard, "winding up" or getting in position for the next slap. The slap and pop techniques are commonly used with
pull-offs and
hammer-ons with the fretting (usually left) hand, to further increase the rate at which notes may be played.
Ghost notes, or notes played with the string
damped, are also commonly played in slap bass to increase the percussive feel of the technique. The invention of slap on electric bass is generally credited to funk bassist
Larry Graham. Graham has stated in several interviews that he was trying to emulate the sound of a drum set before his band had found its drummer. Graham himself refers to the technique as "thumpin' and pluckin. == Variants ==