Hide and Seek is a track by British singer-songwriter Imogen Heap from her 2005 album Speak for Yourself, created almost entirely with layered, vocoder-processed vocals and no traditional instruments. The mmm whatcha say section became widely shared online years later, first in video edits and then on TikTok, where creators used it to underline dramatic reveals, sad twists and ironic moments. Its staying power comes from that instant recognition: listeners identify the harmony within a second, even without knowing the original song.