あの歌は必ずヒットするよ。

あの歌は必ずひっとするよ。

That song's bound to be a hit.

あの歌(うた)は必(かなら)ずヒットするよ。

Ano uta wa kanarazu hittosuru yo.

彼の (あの、かの)

that (someone or something distant from both speaker and listener, or situation unfamiliar to both speaker and listener)

歌 (うた)

song; classical Japanese poetry (esp. tanka); modern poetry

は (は)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

必ず (かならず)

always; without exception; necessarily; certainly; without fail; positively; invariably

ヒット (ヒット)

hit; base hit; safe hit; single; hit; success; hit (e.g. boxing, hockey); blow; hit (i.e. as a search result)

よ (よ)

indicates certainty, emphasis, contempt, request, etc.; used when calling out to someone; used to catch one's breath or get someone's attention; yo!

Readings: カ、うた、うた.う

Meanings: song, sing

Readings: ヒツ、かなら.ず

Meanings: invariably, certain, inevitable