Every artist can catergorized in this way and Drake hits on more themesThe 4 Subjects Of a Drake Album...
1. Sing About A Girl He Used to Have
2. Rap about "Enemies"
3. Rap about His Come Up or His Reign
4. Sing About A shytty Relationship
But my point is that no artist plays on so few subjects like Tiller
Don't know how this can be debated