sonusdex on Instagram: ""There’s a classic riddle that goes something like: “What has a bunch of keys but can’t open a single door?” Most people know it with 88 keys, because that’s how many keys a standard piano has — far more than any regular keychain, yet none of them will unlock a lock or open a door. It plays on the double meaning of the word “keys”: in everyday life, keys are metal tools that open locks, but in music, keys are the levers you press to make notes. The humor comes from that t