#2
the scale lenght is the lenght of the string from the nut to the bridge. lower scale lenghts sound more midrangy (is that a word?). gibson for example uses 24 3/4" and fender, on most of its guitars, 25 1/2"

from wikipedia:
* 20.7 in (527 mm):
o Squier Bullet Mini
o Rickenbacker Electro (student model) Es-16, Rickenbacker 1996, 320 and 325, notably John Lennon's most famous guitar

* 22.5 in (572 mm), known as "3/4 scale" in Fender sales literature:
o Fender Musicmaster
o Fender Duosonic
o Fender Mustang
o Some Musicmaster II and Duosonic II

* 22.72 in (577 mm):
o Fender Stratocaster Junior

* 22.75 in (578mm):
o Gibson 3/4 scale Les Paul Junior and Melody Maker

* 24 in (610 mm), confusingly called "full scale" in Fender sales literature:
o Fender Jaguar
o Most and current Fender Mustang
o Most Musicmaster II and Duosonic II
o Fender Bronco

* 24.75 in (629 mm):
o Gibson Les Paul
o Gibson SG
o Original Gibson ES-150
o Fender Cyclone
o Rickenbacker most electric guitars (including 330, 340, 350, 360, 370, 380, 620, 650, 660)

* 25 in (635 mm)
o Most Paul Reed Smith guitars

* 25.5 in (648 mm), closest to the classical guitar scale:
o Fender Esquire
o Fender Telecaster
o Fender Stratocaster
o Fender Jazzmaster
o Most Jackson Guitars
o Squier Stratocaster
o Most and current Gibson ES-150
o Most Ibanez guitars

* 27 in (686 mm)
o Fender Jaguar Baritone Special HH (tuned B-B)

* 29.25 in (743 mm)
o Gretsch G6144 Spectra Sonic Baritone
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