Continuing our exploration of things Wikipedia is not, the site's written policy goes into significant and purposeful detail listing how Wikipedia is not a "directory", nor a manual or guidebook, "mirror or repository" of links and files, nor, finally an "indiscriminate collection of information".
All of which essentially say the same thing: Wikipedia is not an all-purpose catalog for storing information in whatever manner pleases you. Wikipedia wants to be comprehensive, but not exhaustive.
This might be confusing if you recall that Wikipedia's informal mission statement is to create the "sum of all human knowledge". Perhaps it would be more clear if that was "a summary of all human knowledge".
No, do not post all the lyrics from Exile on Main Street, but yes, add selective commentary about the lyrics from biographers and music critics. What Wikipedia really wants is not just to provide information, but context for information.