bagpipe & bagpipex is non-essential format
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After noting bagpipes spend considerable time every >updmap and LyX reconfigure I attempted to uninstall it using MikTeX only to have it reinstall ... I found posting and set it to "exclude this format when updating all format files" and stopped it (user fixed till next rebuild).
It seems a bug that bagpipe music format is considered a default requirement!!! Could it be changed to an installable music format, or a FAQ up-loaded explaining why it must be installed?
This will be fixed with the next MiKTeX version (May 2016).