What I am going to say needs verification as I do not own this equipment.
To play N.MUSIC or N.RADIO, you need to have a compatible audio master (BS3000,9000,4,BC2...) or no Audio master at all.
All TV can compatible, in main or link rooms. Older TV think it is A.TAPE 2 and PHONO.
To serve the N.MUSIC, there are 3 solutions: Beoport, Beomedia 1 and Beomaster 5.
Now... Beomedia 1 and Beomaster 5 are also seen as a Video device, that can be connected to the TV and controlled with the Beo 4 with on screen menus.
Usually you access it by pressing PC, on modern TV. But older TV do not recognise the PC key, so you can name it differently, like V.AUX.
in that mode you can access the same N.MUSIC and N.RADIO, Web and Photos.
The BM5 does not seem to have a scart, so I still do not know how it is controlled by the TV.