Upstairs Tenant Playing Loud Music All Night, Downstairs Tenant Called Cops

[Matthew Slaughter]

Hey BP Community!!  I woke up to a text this morning from a tenant living below a tenant who was up all night blasting music.  The cops were called by the lower tenant.  Wondering what the next steps are for me as a landlord.  Should I get the police report and send a letter to the upstairs tenant reconfirming with them the stipulation in our lease of quiet enjoyment?  Thanks!!