Alicia Keys is a master of ... into the rapper's 2016 hit "Congratulations." "I just want to vibe on this song right here," Keys said as she walked toward the piano. Following the fun interlude ...

A typical piano has 88 keys spanning just over seven octaves. There are other, smaller keyboards or synthesizers that have fewer keys – most come in increments of 25, 32, 49, 61 or 72 keys.