This is what Home Concert might look like in Learn Mode on a Windows computer (the Mac would be virtually identical) while the performer is playing in bar 13 of Beethoven's Ecossaise. Notice that the current measure is highlighted in gray. Home Concert is waiting for the soloist to play the second chord of that bar, and it is both pointing to that chord in the notation, as well as showing which notes to play on the keyboard at the bottom of the page.