Piano Day is held on the 88th day of the year (29 March in normal years and 28 March in leap years)^[1] in celebration of and reference to the 88 keys on a standard piano. From an idea by the German pianist and composer Nils Frahm in 2015,^[2] "because it doesn't hurt to celebrate the piano and everything around it: performers, composers, piano builders, tuners, movers and most important, the listener", the event has grown in subsequent years with amateur and commercial success.^{[citation needed]}

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Each year, live concerts and online events have been held. There are also SoundCloud and Spotify playlists available from each year.^{[citation needed]}

On Piano Day 2018, Christian Henson of Spitfire Audio launched a website and YouTube channel called Pianobook, dedicated to creating and sharing sampled instruments for free.