Model Entity Framework Many-many Plus Shared Relation

In Entity Framework (model-first), I'm implementing a many-many (e.g. Composition-Anthology) relationship, with an additional relation (Composer) that must match within related set

Solution 1:

Ultimately, based on good data schema feedback (and lack of EF feedback) in two related questions, I proceeded very much as shown in "Bad Idea #2", above.

I've been working with this and it meets all my current needs.

See these for further details on the other bits of the implementation:

• SQL constraint: https://dba.stackexchange.com/questions/41387/manymany-with-shared-relation
• EF5 navigation: Custom Entity Framework many-to-many navigation property