the note the string is being bent to on another string, creating a "unison bend". Bends of one or two semitones are most common, but skilled players may use bends from three semitones to as many as five or more, as can be heard in the solo played by David Gilmour on the song "Another Brick In the Wall Pt.2" from Pink Floyd's album The Wall. In addition to the player's finger strength, the range of a pitch bend is limited to some extent by the type of guitar, string gauge and material, the scale length, and the area of the neck where the bends are played. For example, steel strings bend further in pitch than nylon strings, thin strings further than thick strings, bends in the middle of the neck can go further than bends near the nut, etc. Guitar players may also use a lower tuning to give the strings some slack and achieve further bends. In blues playing, the target note can be slightly higher or lower than a half or whole step. It can be a quarter tone or even a pitch not present in a tempered scale, being a natural third or seventh instead (or close to it). These may also be so-called blue notes. Blue notes are notes that are outside of the song key, and often even between notes of the chromatic scale. A common blue note is a quarter tone between the minor and major third of a major pentatonic scale. The exact pitch can be varied by the player. Difficulties The most difficult moment for beginners practicing bends is getting the note bent to proper pitch. Usually the bend changes note pitch exactly by one semitone or one whole tone (two semitones), and most beginners fail to bend a string exactly to the proper pitch, producing "overbends" and "underbends". Most guitar teachers advise playing the target note on a higher fret, listening closely to its sound and trying to bend the string aiming to get exactly the same pitch. Bending (especially heavy bending, more than one semitone) usually involves touching more than one string with a left (fretting) hand, as seen in the illustration. Bending can make strings break or the guitar go out of tune. Bending, especially wide bending, requires specialized finger strength. It is not uncommon for bending to be awkward or tiring for the hands. However, with proper