I’ve recently been working with Heather Pringle, Music Co-ordinator at Cleobury Mortimer Primary School in South Shropshire in supporting teaching staff in recognising progress over the key stages. We have provided on Shropshire Digital Brain some statments which will support the Attainment Levels in the National Curriculum which have always been difficult to use since they lack clarity for most of us and certainly for non-music specialists.
We hope these are helpful. They can be found from the file listing on this page within my area (keith.shropshire) of Digital Brain: link
Another very uesful piece of work on assessment in music has been undertaken by Katherine Smith and a team of Primary staff and their work can be found here