noun
A song that has become very popular, often used in the context of pop music charts.
See also: ヒット曲
彼女の新しい曲はすぐにヒットソングになった。
Her new song quickly became a hit.
Variant with a middle dot, sometimes used in titles or for clarity.
Synonymous; ヒット曲 is slightly more common and uses the native 曲 instead of ソング.
Loanword from English 'hit song'.