/usr/share/dbus-1/services/music-preview-player.service is in unity-lens-music 6.9.1+16.04-0ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | [D-BUS Service]
Name=com.canonical.Unity.Lens.Music.PreviewPlayer
Exec=/usr/lib/x86_64-linux-gnu/unity-lens-music/music-preview-player
|