YOU SAID:
I love Calpurnia; how have I not listened to their songs before?!
INTO JAPANESE
私はカルプルニアが大好きです。どうして今まで彼らの歌を聴いたことがないの?
BACK INTO ENGLISH
I love Calpurnia. Why haven't you heard their songs before?
INTO JAPANESE
カルプルニアが大好きです。なぜ彼らの歌を聞いたことがないのですか?
BACK INTO ENGLISH
I love Calpurnia. Why haven't you heard their song?
INTO JAPANESE
カルプルニアが大好きです。なぜ彼らの歌を聞いていないのですか?
BACK INTO ENGLISH
I love Calpurnia. Why aren't you listening to their songs?
INTO JAPANESE
カルプルニアが大好きです。どうして彼らの歌を聴かないの?
BACK INTO ENGLISH
I love Calpurnia. Why don't you listen to their songs?
INTO JAPANESE
カルプルニアが大好きです。彼らの歌を聴いてみませんか?
BACK INTO ENGLISH
I love Calpurnia. Would you like to listen to their song?
INTO JAPANESE
カルプルニアが大好きです。彼らの歌を聴きませんか?
BACK INTO ENGLISH
I love Calpurnia. Would you like to listen to their song?
That didn't even make that much sense in English.