The piano has 88 keys, the highest note playable is a high C, often referred to as C8. For a long time, Maria Carey was credited with the highest note – a G7 during a 2003 rendition of the Star Spangled Banner. However, in 2008, a guy named Adam Lopez took the record by hitting a C8 – off the keyboard – in front of a live audience.
At the other end of the scale, the lowest note hit by a human, according to the Guinness Book of World Records, is a gutter-scraping .393 Hz. This was achieved by Gospel singer Roger Menees in 2010. But there is some controversy about that number, as the human ear can’t hear below 18 Hz. Currently, a recording company is on the hunt for someone to record the lowest SINGABLE note – a low E in the work, De Profundis, by Paul Mealor.