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.
화성학: 화음 밖의 음 (Non-chord Tone; 비화성음) [예제 악보 및 듣기 첨부] http://yoonbumtae.com/?p=5992