Red-haired, 20-year-old singer-songwriter Holly Brook has caused a Sarah McLachlan-Tori Amos sensation with her vocals on Fort Minor’s "Where’d You Go"—the most added Top 40 Mainstream track this spring. A la Dido’s appearance on an Eminem hit that launched her platinum career, everyone is curious: "Who is that amazing voice?" Meet Holly Brook. Listen to her debut album, Like Blood Like Honey. Then you’ll know.