Widebody; Low Wing; 2 Turbojet Eng
Flight Crew Air Transport Pilot (ATP)
Situational Awareness; Distraction; Confusion; Communication Breakdown; Training / Qualification
ATC Issue All Types; Deviation / Discrepancy - Procedural Published Material / Policy
Flight Crew Returned To Clearance
Human Factors; Procedure
ILS PRM 16R.  While shooting the ILS PRM to 16R you are instructed to monitor 119.45. While monitoring the frequency while on approach control we heard tower use the monitor frequency for normal tower communications.  This was very distracting.  I thought the monitor frequency was for breakout instructions; or other than normal tower communications.
Pilot reports of being told to monitor a specific frequency. Pilot heard tower using the frequency and was distracted.