From the author's README on Thunderstore

Adds the Swimming album by Mac Miller to skate.

Playlists & Tracklist

Mac Miller - Swimming

Mac Miller - Come Back to Earth
Mac Miller - Hurt Feelings
Mac Miller - What's the Use?
Mac Miller - Perfecto
Mac Miller - Self Care
Mac Miller - Wings
Mac Miller - Ladders
Mac Miller - Small Worlds
Mac Miller - Conversation Pt. 1
Mac Miller - Dunno
Mac Miller - Jet Fuel
Mac Miller - 2009
Mac Miller - So It Goes

Installation

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

Packaged with ReSkate Music Packer

Install Mac Miller Swimming

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

Open ReSkateLauncher.exe and go to MODS.
Search for Mac Miller Swimming 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.