I face a similar situation. I would like to link concepts with Song’s lyrics. But if I create a relation for lyrics, I couldn’t do it, so I turn to simple block and tex; but then I cannot label the whole thing as a single unit of lyrics. If I want achieve this, I will need to create a lyric object for that song object, then relate the lyric object to song object under relation lyrics. Then I would be able to reuse the relation content elsewhere.
The advantage of creating a relation will probably enhance with the following:
FR build title from relation → combine the process components
FR Relation as object → Better reuse of relation, or reduce the difference between relation or object block.
Alternative FR transclusion → Reuse part of the object content as the description(text type or object type) relation, then the ability to reuse elsewhere.