In the past, to see & hear Dolmetsch Recorder Method pieces, Music Theory Online examples or e-Music scores, you needed to install the Scorch plugin from Avid Software.
It was free, incorporated no spyware, took less than a megabyte of disk space and you needed only install it once.
Scorch used code that browsers considered 'unsafe' and slowly browser support for it fell away.
The good news is that Avid, Scorch's owners, have introduced a new service to play web-embedded Sibelius scores.
We are rebuild our webpages to make use of the new service.
This will take a little time so please be patient.
We have converted the Music Theory resource and the Recorder Method resource. We are now working to convert the free recorder music resource. This work should be completed before the end of November 2017.