Tom Tom Club and Mariah Carey: Mariah straight up took the "I'm in heaven/with my boyfriend" verse from the only good song the Talking Heads spinoff group ever released.
Serge Gainsbourg and Brigitte Bardot and Las Liminanas: From the hazy bass line, to the softly spoken French lyrics, to the more obvious "woo woos" throughout the song, it's clear that Las Liminanas are majorly channeling Serge and Brigitte.
Lou Reed and A Tribe Called Quest: Some obvious musical borrowing is ethically questionable, but others are done tastefully and with respect, like "Can I Kick It." Both songs are, in my book, equally epic.