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In page Lead Belly:

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Lead Belly played with finger picks much of the time, using a thumb pick to provide walking bass lines described as "tricky" and "inventive",[2] and occasionally to strum.[citation needed] This technique, combined with low tunings and heavy strings, gives many of his recordings a piano-like sound. Scholars have suggested much of his guitar playing was inspired equally by barrelhouse piano and the Mexican Bajo Sexto, a type of guitar that he encountered in Texas and Louisiana.[3]