From the author's README on Thunderstore

Adds In Utero to skate.

Playlists & Tracklist

Nirvana - In Utero

Nirvana - Serve The Servants
Nirvana - Scentless Apprentice
Nirvana - Heart-Shaped Box
Nirvana - Rape Me
Nirvana - Frances Farmer Will Have Her Revenge On Seattle
Nirvana - Dumb
Nirvana - Very Ape
Nirvana - Milk It
Nirvana - Pennyroyal Tea
Nirvana - Radio Friendly Unit Shifter
Nirvana - Tourette's
Nirvana - All Apologies

Installation

Install via Thunderstore Mod Manager, or drop into your ReSkate launcher.

Packaged with ReSkate Music Packer

Install Nirvana In Utero

You need ReSkate and your own copy of skate. on Steam.

Open ReSkateLauncher.exe and go to MODS.
Search for Nirvana In Utero and click install. The launcher also installs anything it depends on.
Press PLAY. In game, the MODS tab of the ReSkate menu (Insert) turns it on and off.

Or install it by hand: download the .zip and drop it on the launcher window, or unzip it into its own folder in Mods\ beside Skate.exe.

Maps show up in the ReSkate menu's level list. To join a server running a custom map, you need the same map installed. If the game won't load after installing, see known issues.

skatemods doesn't host or review this mod. The download comes straight from Thunderstore. Only install mods you trust, because scripts can run code.