For The Musicians In Here: Virtual Pianos
I am no musician. However the two links here lead to two 'virtual pianos' which sound quite good on my little laptop here.
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Link: The Virtual Piano for Songwriters, Singers, Producers and aspiring musicians
This piano does not seem to be as responsive as the first but that could be the fault of my laptop rather than the website. Also seems electronic like the Stylophone as advertised by Rolf Harris in the 70's [showing my age!]