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In-wall fiberglass insulation question

I am building a small scale studio in the near future. i will be building the stud framing out of 2" x 6"'s to add a bit more space for insulation to dampen the audio from both the inside and out. I am debating if I should use R-19 or R-24 fiberglass insulation for the in wall insulation. I would have gone with spray in, but it doesn't last that well over the long run.