Guitarrón mexicano

The guitarrón mexicano (Spanish for "big Mexican guitar", the suffix -ón being a Spanish augmentative) or Mexican guitarrón is a very large, deep-bodied Mexican six-string acoustic bass guitar played traditionally in Mariachi groups. Although similar to the guitar, it is not a derivative of that instrument, but was independently developed from the sixteenth-century Spanish bajo de uña ("fingernail[-plucked] bass"). Because its great size gives it volume, it does not require electric amplification for performances in small venues. The guitarrón is fretless with heavy gauge strings, most commonly nylon for the high three and wound metal for the low three. The guitarrón is usually played by doubling notes at the octave, a practice facilitated by the standard guitarrón tuning A₁ D₂ G₂ C₃ E₃ A₂. Unlike a guitar, the pitch of the guitarrón strings does not always rise as strings move directionally downward from the lowest-pitched string (A₂, which is the 6th string from the lowest-pitched string, is a perfect 5th below its adjacent string E₃).

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The guitarrón was the inspiration behind Ernie Ball's development of the first modern acoustic bass guitar, released on the market in 1972.^[1]