I removed the less likeable songs
What's most concerning is many of these artists have much better songs in their discography, but you chose mediocre ones. Of all Katy Perry songs you chose This Is How We Do? Replace it.
Opulence should be replaced by Feel Myself (Alcohol)
Shower could be replaced by any track other than the title track from the Play It Again EP
Boom Clap could be replaced by You (Ha Ha Ha), Grins or You're The One
I haven't listened to Ultraviolence yet but I'm guessing Brooklyn Baby could be replaced by a lot of Born To Die or Paradise
Double Bubble Trouble could be replaced by Bring The Noize, Paper Planes, Come Walk With Me, Bad Girls, Only 1 U
**** U Betta and Gold could be replaced by Bad Dog, Pink Fields, I'm Doin Me, Midnight Sun, Gypsy Stars, Some Like It Hot
Stay High is very good but I think Over is pretty much on an equal level so you could switch them or add Over
just my suggestions
Her knees are really something though 