Mute Song (either subsidiary of Mute Song Ltd., or brand that refers to itself)

"Mute Song is the London based music publishing arm of the Mute group of companies alongside a record label (Mute) and artist management division." (iow, "Mute Song" essentially refers to UK music publishers Mute Song Ltd.) — http://mutesong.com/about/

Perhaps related to Mute Songs (an extra 's' at the end).
.
Mute Song, 1 Albion Place, London, W6 0QT.
Email: music.publishing(AT)mute.com
Tel: +44 (0)20 8600 7960