A song that is currently popular or was a hit; can refer to contemporary pop songs or older hit tunes.
This popular song is often sung among young people.
I bought a CD collecting popular songs from the Showa era.
はやり歌 is a more colloquial, old-fashioned way of saying 流行歌, both meaning a currently popular song.
Standard kanji spelling for 'popular song'.
Search-only form; not a standard spelling.
Variant with okurigana り; less common but still used.
Uses the older kanji 唄 for 'song'; gives a traditional or folk-song nuance.
Rare variant without okurigana and with 唄.
Compound of 流行り (はやり, 'popularity, fashion') and 歌 (うた, 'song'). The spelling 流行歌 drops the okurigana り, which is common in Sino-Japanese compounds.