End-to-end encryption and privacy controls.
Message and call for free* around the world.
Group conversations made simple.
Say it with stickers, voice, GIFs and more.
Reach your customers from anywhere.
[음악] 금지되는 화성진행(병행, 은복), 성부 진행의 원칙 (예제 악보 및 듣기 첨부) http://yoonbumtae.com/?p=1701