Popular Song
noun
You know that 流行 refers to a "trend." So, a "trend" song is a popular song.
りゅうこうか
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
え、「流行歌」って言葉、ちょっと古くない？おじいちゃんとかおばあちゃんっぽい。
Oh, is the term "ryūkōka" a bit outdated? It sounds more like something grandparents would say.
ワシは今時の流行歌は全然分からんぞ。
I don't know trendy songs these days at all.
これって50年代の流行歌のリメイクなんだって。
I heard this is a remake of a popular song from the 1950s.