Shakira is the only right answer, we're talkin about Unique and the simple fact that she has so many Spanish songs, and her biggest hits are also Latin Influenced ...
Gaga and Katy has only 2-3 albums
Christina - she has only 3-4 albums the others are too Indie no one knows em
Britney - her voice is unique but her discography .. not really
Adele has only 2 albums
Riri - the same as Britney
Rihanna. Her discography embodies so many facets and genres of music from pop, r&b, reggae, dancehall, dubstep, techno, electronic, hip-hop/rap, trap, and EDM. She constantly re-invented herself and her music throughout her entire career and never became stale, dull, or redundant.
Katy getting two votes! Slay a bit Shak 
