Do you know there's a piano on my foot?

Most pianos have 88 keys and between 216 and 250 strings

As Time Goes By
On December 14th, on the 70th anniversary of the premiere of Casablanca, the piano played by Dooley Wilson went under the hammer at Sotheby's in New York. The 58-key piano was used to perform the classic "As Time Goes By", which is a shade of yellow and green, had a pre-sale estimate of $800,000 to $1.2m. In the end it sold for $602,500 to an unnamed buyer.