つかさ, ともがら, へや
When underground music makes it out into the light of the sun (the public), it finally becomes official. Music isn't really real unless people hear it outside of those secret underground concerts.
Once the music is official, you'll feel it in your soul (そう). When you listen to it outside, under the bright sun, your soul gets to finally hear it too.
Currently there are no similar looking kanji which exist in the WaniKani learning system