Diana's house was crowded with happy people whose spontaneous outbursts of song were accompanied by lively music.

戴安娜的房子挤满了幸福的人们，他们在欢快音乐的伴奏下不由自主地唱起歌来。

《柯林斯英汉双解大词典》

Do you know that the "Happy Birthday to You" song is the first song sung in outer space?

你知道吗？“祝你生日快乐”这首歌是在外太空唱的第一首歌。

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Every time I hear that song I feel happy.

我每次听到那首歌都感到很愉快。

《牛津词典》

It was a four-wheeled celebration that arrived at the field, usually in the middle innings, and it sat there for the rest of the game, playing its creepy-happy little ice-cream-truck song, taunting you.

WSJ: MLB Wild Card: Bringing the Ice-Cream Truck Back Into Baseball �� Jason Gay

For music-lovers, this is a happy song.

ECONOMIST: A new song

The start-and-stop process of rehearsal has led to plenty of inside jokes, a special handshake and even an appropriately off-kilter original song that they are happy to sing for a visitor in Broadway perfect tone, of course.

WSJ: The 4 girls who play 'Matilda' bond offstage