What are the string notes for bass guitar tuning?

Standard tuning for 4 string bass guitar is E A D G - the same as the lowest-sounding strings of a six-string guitar, but an octave lower.

This goes from the 4th string (the thickest string) to the 1st string (the thinnest string)...

E - 4th string - Thickest string - Lowest note
A - 3th string
D - 2nd string
G - 1st string - Thinnest string - Highest note

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