Answer:
The standard tuning for a 4 string bass is E, A, D, G (the same as the four lowest strings on the guitar but one octave lower). The bass strings are tuned in fourths.
Step-by-step explanation:
Use a tuner such as the guitar tuna App (Its on Apple and Android + It is free)or a personal tuner. You can also use a piano and you can find a guide for it online.
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