Typical walls in residential housing has very little sound blocking quality because the sound energy and vibration transfer easily from one side through to the other because the studs provide a direct soundpath.
Super Soundproofing InsulTrax Channel Isolation Kit - 32 Sq. Ft. Set of 4 (4' lengths) plus Acoustical Caulk - Fasteners- Vibration Support Pads and Instructions. May be applied over existing wall.
This will cover a 8' high wall 6' wide. For a 4' wide wall, order 2 4' kits. For a 10' wide wall order 1 4'' kit and a 6' (48 Sq Ft.) kit. For a 12' wide wall order 2 6' kits etc.
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