Terrariamod is 65mb, dwarfing pretty much every other mod in any modpack it's in. It is over 4 times the size of Botania, a mod that adds a shitton of content and also adds large music files, and nearly 5 times the size of Create, a mod that adds a shitton of content. It is by far the largest mod in Blanketcon.

It also may not be legal to redistribute Terraria music in the first place.