I never knew this until I took a “History of Popular Music” course in high school, but the Black Eyed Peas sampled Dick Dale and the Deltones’ Miserlou in their song Pump It. It plays in the beginning as a very key component and then serves as a nearly constant background accompaniment, peaking at the chorus. There are other instruments and beats going on as well, but it makes a very obvious contribution to the song.
Switchfoot used a interpolation of their own song. On their album Hello Hurricane, the opening track is Needle and Haystack Life. The last track is Red Eyes, which uses the chorus from Needle and Haystack Life at the end of the song in the background of an instrumental section. “In this needle and haystack life/I found miracles there in your eyes/It’s no accident we’re here tonight/We are once in a lifetime.” Throughout that interpolation, themes from Red Eyes overlaps it in a very ambient-like way.