I sing out loud and merrily.

我就要放声歌唱，欢天喜地。

youdao

Sing Out Loud!

大声唱出来！

youdao

Sing out loud and sing out strong. Don't worry that it's not good enough for anyone else to hear. Just sing, sing a song.

高声唱，放声唱，不要担心唱得不够好让别人听到，尽管唱吧。

youdao

The children are shy and don't want to sing out loud.

NPR: Crumpet the Elf Reads from Santaland Diaries