| Learn another instrument because you want to learn it, not because it will help you learn your primary instrument. Learning your primary instrument will help you learn your primary instrument. However, having learned guitar first because I wanted to learn guitar, then picking up bass because then I wanted to learn bass, it was easier to learn how to play bass. By learning guitar first I learned chord structures (triads, inversions, voicings), the fretboard, scales, etc. All that applied quickly to bass.
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"It is difficult to answer when one does not understand the question." - Sarek
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