The sheet music for Leyenda indicates alternating I and m for the b on the second string for measures 1-16.
Is that the way it is typically played? When I play it using i only it sounds more consistent to me.
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You could use an alternation of only p & I or you can use P & M only. I like alternating between I & M to prevent fatigue and avoid future tension when the piece becomes more challenging. Do what works best for you and let me know if you have any additional questions.