As a host you can play your own music to the room by sharing a browser tab's audio - for example the Spotify web player. In the music card, switch to Your music and follow the steps to share the tab (remember to tick "share tab audio"). This works in Chrome or Edge on a computer.
You can pause it for the room any time - your tab keeps playing, members just hear silence until you resume. Please use an ad-free source, and members always set their own volume.