Depending on the school, over the years many of the unit plans have been developed using the National Curriculum for music or variations of them. You can see them below.
For 9 years I taught IB music either as a stand alone class or merged with ensembles
I also have two years experience teaching with the International Baccalaureate Middle Years Program (MYP) you can see that curriculum with the link below.
As well as teaching music, I have taught both the MYP technology and the IGCSE Technology class following the syllabus linked below.
Joseph Granzow 