Educatingalllearners.org provides a library or resources for teachers who are working with children with special needs during the COVID-19 pandemic.
Supporting Students with Disabilities in K-12 Online and Blended Learning
This site is not specific to music but it's a good one-stop resource for planning instruction in virtual or blended learning situations.
Resources for Teaching Remotely
CEC continues to provide resources and support during the COVID pandemic in many areas such as higher education, administrators and educator self-care to name a few.