Do Beholder Beasts Have ears?

[trikkydik]

I would allow the mirror trick I work were I the DM, provided that the Bard was still within 90ft of the Beholder. RAW-wise though, I have no idea on the ruling of that.
Loudness isn't really a factor for the effectiveness of the song. At most I would say the volume would only counteract any other noises that might be applying a circumstance penalty to the Performance check.

i guess the extra boost in sound would be to help rogues make sneak attacks on captivated beholders. Whether youre a DM or a PC you have good knowledge, thank you for that.

Im the DM and ive kind of thrown my PC's into a precarious position and im trying to think of ways in which they can survive this encounter.

Have you ever had to fight several beholders at once before? if yes, what did you do? if no, what would you do if you had to fight more than 20 beholders? (Setting is at a home base, with many places to hide.)