One of the Best Ideas of SoundProofing is "SoundProof Curtains" it actually Block outside Noise coming from Windows. Check Here: livesoundproof.com/best-soundproof-curtains/
This is the one he installed. www.lowes.com/pd/M-D-6-3-4-ft-x-1-1-8-in-Brown-Top-and-Sides-Replacement-Seal-Foam-Door-Weatherstrip/1097851 $4.72 each, need 3 to do a door.
Maybe I'm looking for something that doesn't exist anymore, but do they make this add-on / screw in but Magnetic to connect to a Steel door? I can only find Kerf style and not screw on after-market...