이양일 - Lee Yang-Sun (Yi Yang-Sun)
Tracks can be found here:
가요(歌謠) 박물관 220 Best Of (CD-box)
CD4-2 행복의 샘터 / Fountain of Happiness (1964)
with 박재란 / Park Jae-Ran
We only have one track to get to know this singer who's voice is clearly fully adapted to trot-like singing. Here we have a duet with Park Jae-Ran who sings slow and in an idealising expression. It's the kind of TV-like colorized romantic music which makes it in fact pretty mainstream.