But the biggest of her feuds? Spotify, and Katy Perry. And on Thursday night, the Cersei Lannister of Top 40 pop used one to go after the other. Taylor Swift's music is back on Spotify ...

That is, arch-nemesis Katy Perry also just ... sticking point with Spotify in particular. The company is the word's biggest music streaming service and the only major one to offer an ad-supported ...

Katy Perry’s 2011 song "Last Friday Night (T.G.I.F)" from her third studio album, Teenage Dream, has debuted on US Spotify.