Link a signal to the PUIDs associated with it, that is, PUID computed from MusicalItems (mo:AudioFile) derived from this signal. PUIDs (Portable Unique IDentifier) are the IDs used in the proprietary MusicDNS AudioFingerprinting system which is operated by MusicIP. Using PUIDs, one (with some luck) can identify the Signal object associated with a particular audio file, therefore allowing to access further information (on which release this track is featured? etc.). Using some more metadata one can identify the particular Track corresponding to the audio file (a track on a particular release).