The new track added in the 20w16a snapshot (15/04/2020) for the 1.16 Nether Update. It was composed by Lena Raine.
Support Lena on her bandcamp page here: https://radicaldreamland.bandcamp.com/
This music appears as a music disc that can be only found in Bastion Remnants chests.
Also check out the stereo mix (which sounds even better) here:    • Minecraft OST  Pigstep (Stereo Mix)  

► Minecraft OST PLAYLIST:    • Minecraft  OST  

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