To begin you must scour the earth for a wooden crate, upon breaking you will find damaged cassettes and CDs. If you are having trouble finding crates you may be able to purchase damaged cassettes and CDs from the Wandering Trader. Upon finding a few you will be able to salvage and repair them to craft blank cassettes and CDs respectively.

I recommend using JEI to find the recipes for each of the songs.

The tracks are:

Emlyn - Goodbye 323

Emlyn - Insomnolent

Emlyn - Men on the Moon

Emlyn - Self-Reflection

Emlyn - Contemplation

Emlyn - Overcast

Emlyn - Going Beyond

Emlyn - The Old Days

heliogram - We Are The Ones Who Convert Mind To Matter

heliogram - Greem

heliogram - Gills

heliogram - Hair

Silencerized - Stalagmites

Silencerized - Fangs

MachUPB - Technofall

All of the cassettes and CDs function as music discs and are used on the jukebox.

Credits:

Cassette Mod: The Pamps, CreamMcGee, heliogram, Bryan, scott, Silencerized, EMLYN and MachUPB

Fabric Exporter for MCreator: Goldorion, BoogieMonster1O1, crispy_chips1234 and Klemen

And of course MCreator for once again being an amazing tool.

Cassette Mod Reloaded