National Curriculum:
https://www.gov.uk/government/publications/national-curriculum-in-england-music-programmes-of-study
Subject Associations:
Music Teachers Association: https://www.musicteachers.org/
Incorporated Society of Musicians: https://www.ism.org/
Exam Boards:
AQA: https://www.aqa.org.uk/subjects/music
Edexcel Pearson: https://qualifications.pearson.com/en/qualifications/edexcel-gcses/music-2016.html
OCR: https://www.ocr.org.uk/qualifications/by-subject/music/
BBC Bitesize:
KS3: https://www.bbc.co.uk/bitesize/subjects/zmsvr82
KS4: https://www.bbc.co.uk/bitesize/subjects/zpf3cdm
TES Resources:
https://www.tes.com/teaching-resources/hub/secondary/music
Oak National Academy:
https://www.thenational.academy/teachers/programmes/music-secondary-ks3/units
Additional resources – suggestions by Teacher Training Advisers in your subject:
https://sites.google.com/tiffin.kingston.sch.uk/music/home