Hollow doors tend to be much worse for sound insulation since they re not a heavy mass.
Sound insulation doors.
Wood composite is a slurry of wood fiber and polyurethane resins that can closely mimic the look of real wood and which provides excellent insulation against both sound.
Solid core doors are the most cost effective soundproof doors.
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However it also makes this type of exterior doors much more effective at soundproofing than interior ones.
One of the most common types of such doors has a polyurethane foam insulation core that s encased between layers of steel.
If your door already has molding around it you ll need to pry it off.
Solid composite interior door.
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Another option would be to get a solid core door to prevent noise from coming through.
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Because this barn style door slides on a track mounted above the door frame it can be thicker and thus more soundproof than a door mounted within the doorframe.
However you can install a new solid wood or metal door to cut out the sound significantly.
Sliding solid wood barn door.