Originally performed by the talented duo Alex & Sierra, 'Little Do You Know' is a gorgeous pop ballad that showcases the singers' impressive vocal blend and emotive storytelling. 🎶🎹 New Sheet Music Release: 'Little Do You Know' by Alex & Sierra! 🎹🎶Īre you a fan of heartfelt and soul-stirring pop music? Then you'll absolutely love our latest sheet music addition - 'Little Do You Know' by Alex & Sierra! This beautifully arranged piece by SolKeys will make a fantastic addition to any pianist's repertoire.