Random Song Occurring on Server

hello ! i’m running into an issue where an extremely loud song plays for 15 seconds at seemingly random times. we have not been able to replicate it, but one player has run into the issue several times a day while wearing headphones, no matter where they are in the server or what they are doing. adjusting their client-side settings & launcher did not fix it, and two other players have heard it as well.

it is extremely loud and unpleasant, definitely NOT something we purposefully added to our server. we run a pretty vanilla SMP server and have no clue what could be causing it. any advice would be appreciated.