"Sibelius was originally developed by British twins Ben and Jonathan Finn for the Acorn Archimedes computer, under the name 'Sibelius 7'. Development (done on R

"Sibelius was originally developed by British twins Ben and Jonathan Finn for the Acorn Archimedes computer, under the name 'Sibelius 7'. Development (done on RISC OS entirely in assembly language) was started in 1986, just after the Finns left school, continuing while they were at university." There was a window of time... but the Finn brothers re-wrote the code in C++ for Windows/MacOS, then sold(?) product to Avid.