Real dumb question but....

I’m totally new to linux and just got rid of windows. Umm where do I put music files that I want to share between user accounts on the same computer?

I always have a separate partition for this.

or
You can create a folder in the tree and set permissions for all users

The most logical place would be to create a folder in the /home folder (naming it All Users or Shared or something like that); then you right-click on it from Konqueror or any other file browser and set its permissions accordingly (it should probably be writable/changeable by all users and owned by, say, root). To be able to set these permissions, you have to run the Konqueror session as root (sudo Konqueror or su → root password → Konqueror).
Welcome to the community! I’ve migrated fairly recently myself.