Sound barrier for thin interior walls 1 7/8.?

we are building a living quarter in a metal building and was wondering if anyone knew what works the best to block the sound from one room to the next the walls are 1 7/8 inch thick between sheathing is 7/16 osb board textured . I have been told spray foam does not really help with sound proofing and i dont think vat insulation would fit between

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