I'd start off looking at custom post types for each different "object". As ahint, an object would be things like "band", "song", "artist", etc. From there you will have to figure out how to link each of these together. Most times I'd use either a custom database column if I need a many-to-many relationship (like bands and members) or set up post_parent for a one-to-one relationship (like song to band).
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