Some maths:

Servers: 18
A song with decent quality: 44kbps
full party members: BRD+7
Bards per server (unknow, hypothetical case: server 4000 players (if game work after 2.0) then around 200-300 BRD, ~250)

So if 250 BRD play at same time a custom music to their full pt:


18*250*7*44kbps: 1386 mbps

This is of course the worst scenario, anyway: No thanks.

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And i am not counting i can record a pornographic audio and play it in the game...

So, this is totally imposible.