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pretty much anything that has packages ends up needing a package manager, and everyone seems to roll their own

FWIW lyp is the _only_ package manager for Lilypond.

I meant every project rolls its own (e.g. ruby has gems, perl has cpan, tex has ctan, etc.); there is no generic package manager that is used by different ecosystems even though you'd think a lot of the problems being solved were not specific to the project.

Why wouldn't it?

Lilypond is basically LaTeX for music.

Lilypond differs from most other music notation programs in that it's basically a compiler of source files written in Lilypond (and Scheme) syntax. Lyp acts as a package manager in order to allow Lilypond users to share and reuse code.

Lyp – The Lilypond Swiss Army Knife