Version 3.23.4-6 of solfege is marked for autoremoval from testing on Thu 14 Nov 2019. It depends (transitively) on lilypond, affected by #941537. You should try to prevent the removal by fixing these RC bugs.
Last update: 2019-10-18
Depends on packages which need a new maintainer
The packages that solfege depends on which need a new maintainer are: