Three way of promoting ones music are:
1)use musescore com,
2)post on a facebook group, I posted on the violinist group by uploading a .zip file of lots,
with the benefit of hindsight the best way would have been to upload either the .xml or musescore...
3)use recordmydesktop (I have not got it to work yet), run the file using 200% and continuous, post on youtube,