I think the reason the named treant attacked you is you probably ran by a
wolf or lion and accidently hit it with your song. Those treants are like
all those goodie-goodie druid types who attack you if you attack their
precious animal friends. They don't even ask if the animal attacked first...

If you ever get a song stuck on again like that, try using the /stopsing or
/stopsong command. I forget which it is, but it will stop your song. Good
luck to you!

-Reyen on Bristlebane