Not sure if this is a Mekanism bug, a Java bug or a Windows Media Player bug.

Had WMP playing music while testing a local Minecraft server when I noticed the music sounded odd. Closed WMP and discovered that all the Mekanism machines I had built (Metallurgic Infuser, Enrichment Chamber, Osmium Compressor, Energized Smelter) were each playing a separate 10-16 second loop of Brahms when active.

Any new Mekanism machine I build does the same. Removing the machines then replacing them doesn't affect it. Have restarted the client, the client PC and the server PC.

Using Mekanism build 7.1.1.127

It's very strange, but also quite entertaining :)

Update: It's resolved itself. Another client and server restart seemed to fix it. Shame, it was kinda funny :)

I think this is actually a Christmas Easter egg :)

Not sure if serious or not :) Either way it made me laugh.