가요가 · 가요를
popular song, pop music (especially Korean)
Example
저는 요즘 한국 가요를 들으면서 한국어를 공부해요.
These days I study Korean while listening to Korean pop songs.
Word parts
가 song+요 ballad
Literally 'songs and ballads.' Don't confuse it with 가요 'I go.'
Good to know
K-pop is often called 가요 in Korea; 케이팝 is used more when talking about it internationally.