This is the sort of thing I've been thinking about in building Bucket Brigade (https://echo.jefftk.com https://echo.jefftk.com). It's video chat, but you can s

This is the sort of thing I've been thinking about in building Bucket Brigade (https://echo.jefftk.com https://echo.jefftk.com). It's video chat, but you can switch into a mode for singing. Each person is in a bucket, and you can hear the people in earlier buckets and be heard by the people in later buckets.