Lily Allen made her U.S. television comeback this week, while some music legends made appearances to show the whippersnappers how it's done.

British singer Lily Allen came back earlier this month with Sheezus, her first album since 2009. She played her single "Hard Out Here" on The Tonight Show.




Neil Young crammed himself into a tiny booth, under the watchful eye of Jack White, to deliver a take on the classic country balled "Crazy," which is on his new covers album, A Letter Home.




Iggy Azalea brought out her hits "Fancy" and "Work" on Jimmy Kimmel Live.






Foo Fighters drummer Taylor Hawkins brought his side project, The Birds of Satan, to Kimmel.




Dolly Parton played "Home" from her latest, Blue Smoke, and her classic "Jolene."






And finally, Mariah Carey took to the Today show to sing her Number One hit from 1996, "Always Be My Baby."