Vanessa Carlton and Stevie Nicks, “Carousel”; Sade and Jay-Z, “Moon & the Sky”

Today in new music: Longtime buddies Stevie Nicks and Vanessa Carlton perform a new VC song (at the 3:10 mark), while Jay-Z remixes Sade’s “Moon & the Sky,” off her awesome Soldier of Love album from last year. Both sort of moody and Monday-appropriate. Plus: Britney’s Rihanna remix: “S&M.;”