Please update Asunder to 2.9.6.
FreeDB was shut down in March 2020 and release 2.9.6 has support for gnudb.gnudb.org

Link to tarball:
http://littlesvr.ca/asunder/releases/asunder-2.9.6.tar.bz2

Changelog:
28 May 2020 - 2.9.6

• Changed the default CDDB server to gnudb.gnudb.org
• Asunder can now be more easily Flatpak-ed. Tanks to Kevin "Eonfge" Degeling for the help.
• Updated eo, it, pt, pt_BR, sq, and zh_CN translations.
• Updated config.guess and config.sub with the current latest to support (among other things) aarch64.

21 Oct 2019 - 2.9.5

• Updated Catalan and Spanish translations.

The following was contributed by Felix Braun:

• Updated Opus support to have a smooth progress bar.

29 Aug 2019 - 2.9.4

• Updated Finnish and Swedish translations.
• Added support for joining artist and title in title field (thanks to Tom Bailey)