Songs with sections that remind you of other songs...

[Blackbird]

...like The Who's The Kids are Alright has a bit that sounds like the Beatles' All My Loving. Also, World Party's Way Down Now has background "woo woos" that remind me of Sympathy for the devil" and Rod Stewart's "Do you think I'm Sexy" sounds like the opening of Jorge Ben's (my avatar) Taj Mahal.

Any others?

[The BurgerMeister]

there's a section in Mr. Bungle's "Goodbye Sober Day" which is reminiscent of Kecak chanting from Bali....