The Velvet Rope and anyone trying to say otherwise is lying.

Taylor Swift- Speak Now

With songs like Enchanted, Last Kiss, Long Live, Dear John, Never Grow Up, Mean, Ours, & Haunted

RED has epic songs on it, just like SN does, but RED also has filler, where as Speak Now doesn't. Therefore giving Speak Now the edge.

Butterfly

Adele's "21"

hidden gem everyone needs to check out: run the jewels by el-p and killer mike
also, for kendrick everyone talks about GKMC (which is amazing) but the kendrick lamar lp is extremely underrated.
my faves best 2 albums are diamond, they arent exactly hidden

Katy - Prism
Ellie - Halcyon
Lana - Born to Die
Kesha - Warrior

Songs About Jane

Kanye - Late Registration

As for hidden gems:
La Roux - La Roux (electro-pop)
Laura Marling - Alas I Cannot Swim (coffee-shop folk pop, but very good)
Cut Copy - In Ghost Colours (80s influenced synth pop)
Phoenix - Wolfgang Amadeus Phoenix
MIA - Arular and Kala (both amazing!)
Janelle Monae - The ArchAndroid
Interpol - Antics
Animal Collective - Merriweather Post Pavillion (experimental/psychedelic pop)
Tame Impapa - Lonerism (psychedelic rock/pop)

All I Ever Wanted. For Gaga anything but ARTPOP really...