From the author's README on Thunderstore

Adds a bootleg tape of G-Sides I found online.

Playlists & Tracklist

Gorillaz - G Sides - Bootleg

Gorillaz - Re-Hash
Gorillaz - 5/4
Gorillaz - Tomorrow Comes Today
Gorillaz - New Genious (Brother)
Gorillaz - Clint Eastwood
Gorillaz - Man Research (Clapper)
Gorillaz - Punk
Gorillaz - Sound Check (Gravity)
Gorillaz - Double Bass
Gorillaz - Rock The House
Gorillaz - Starshine
Gorillaz - Slow Country

Installation

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

Packaged with ReSkate Music Packer

Install Gorillaz G Sides Bootleg

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

Open ReSkateLauncher.exe and go to MODS.
Search for Gorillaz G Sides Bootleg 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.