this coy phrase accompanied 30 pianos strewn about london, installed by artist luke jerram and just beckoning people to play them. i don't remember how long they were out there, but the last day of installation was yesterday (the day the music died, i suppose). but youtube videos abound of performances, such as:
the 8 hour, 24 piano playing spree of joplin's maple leaf rag
a virtuoso in a young boy playing chopin's waltz in e minor
hm...if this came to boston...