I believe this was mentioned at some point alongside dunst as an example of a package that for whatever reason has libsystemd as a hard dependency, just because it includes a systemd service script, but MPD currently cannot be installed on Obarun from the Arch repos.
warning: ignoring package systemd-libs-249.4-2
warning: cannot resolve "libsystemd.so=0-64", a dependency of "mpd"
:: The following package cannot be upgraded due to unresolvable dependencies:
mpd
Is there any chance MPD could be added to the Obarun repos without all that in the way? mpdscribble (from the AUR) would also be nice for Last.fm integration with it, but I'm not as desperate for that one at the moment.