At Delmark” includes standards such as Junior Wells’ “Messin’ With the Kid” and unexpected tunes like Neil Young’s “Heart of Gold” and AC/DC’s “Riff Raff” — all instrumental and all on piano.

A standard piano has 88 keys: 52 white and 36 black. But who decided this number would be the norm, and why? The king of instruments has played a significant role in music history. From concertos and ...