dbouya, I'll invite you to read post #18 in this thread.
https://www.project1999.com/forums/s...7&postcount=18
This isn't just "some bard", it's Kendrick, a game dev.
There was nothing stopping any bard from pulling tons of mobs and singing AoEs on the group of them, but before September 1999 they would be hitting only 4 mobs at once in the swarm. If they were stacked up you probably wouldn't be able to tell the difference just by looking, you'd need to be close enough to see how many were being hit in the combat window.